diff --git a/Sprint-3/1-key-errors/0.js b/Sprint-3/1-key-errors/0.js
index 653d6f5a0..dd7dfa253 100644
--- a/Sprint-3/1-key-errors/0.js
+++ b/Sprint-3/1-key-errors/0.js
@@ -1,13 +1,22 @@
-// Predict and explain first...
-//  =============> write your prediction here
-
-// call the function capitalise with a string input
-// interpret the error message and figure out why an error is occurring
-
-function capitalise(str) {
-  let str = `${str[0].toUpperCase()}${str.slice(1)}`;
-  return str;
-}
-
-// =============> write your explanation here
-// =============> write your new code here
+// Predict and explain first...
+//  I am predicting the code will generate error because the variable str is declared twice
+
+// call the function capitalise with a string input
+// interpret the error message and figure out why an error is occurring
+
+/*function capitalise(str) {
+  let str = `${str[0].toUpperCase()}${str.slice(1)}`;
+  return str;
+}
+console.log(capitalise("hello World"));*/
+
+// After we run the code, it generated this error SyntaxError: Identifier str has already been declared
+// This happened because we tried to declare again using the keyword let the variable str
+// which was declared before in the parameter of the function
+
+//Here is the fixed code
+function capitalise(str) {
+  str = `${str[0].toUpperCase()}${str.slice(1)}`;
+  return str;
+}
+console.log(capitalise("hello World"));
diff --git a/Sprint-3/1-key-errors/1.js b/Sprint-3/1-key-errors/1.js
index f2d56151f..fd820ff79 100644
--- a/Sprint-3/1-key-errors/1.js
+++ b/Sprint-3/1-key-errors/1.js
@@ -1,20 +1,32 @@
-// Predict and explain first...
-
-// Why will an error occur when this program runs?
-// =============> write your prediction here
-
-// Try playing computer with the example to work out what is going on
-
-function convertToPercentage(decimalNumber) {
-  const decimalNumber = 0.5;
-  const percentage = `${decimalNumber * 100}%`;
-
-  return percentage;
-}
-
-console.log(decimalNumber);
-
-// =============> write your explanation here
-
-// Finally, correct the code to fix the problem
-// =============> write your new code here
+// Predict and explain first...
+
+// Why will an error occur when this program runs?
+// I predict the code will generate 2 errors because one the variable decimalNumber is declared twice and two
+// the function is not called instead the variable decimalNumber is called and it can't be accessed because
+// it was declared locally as a parameter of the function
+
+// Try playing computer with the example to work out what is going on
+
+/*function convertToPercentage(decimalNumber) {
+  const decimalNumber = 0.5;
+  const percentage = `${decimalNumber * 100}%`;
+
+  return percentage;
+}
+
+console.log(decimalNumber);*/
+
+// After we run the code, it generated an error SyntaxError: Identifier 'decimalNumber' has already been declared
+// because we tried to declare decimalNumber again. After fixing this error again we got another error ReferenceError: decimalNumber is not defined
+// because the decimalNumber is locally scoped, javascript can't access it when the function is called
+// additionally the function was not called  console.log(decimalNumber) this simply means print the value of decimalNumber
+
+// Finally, correct the code to fix the problem
+// Here is the fixed code
+function convertToPercentage(decimalNumber) {
+  const percentage = `${decimalNumber * 100}%`;
+
+  return percentage;
+}
+
+console.log(convertToPercentage(0.5));
diff --git a/Sprint-3/1-key-errors/2.js b/Sprint-3/1-key-errors/2.js
index aad57f7cf..dfdb0d395 100644
--- a/Sprint-3/1-key-errors/2.js
+++ b/Sprint-3/1-key-errors/2.js
@@ -1,20 +1,21 @@
-
-// Predict and explain first BEFORE you run any code...
-
-// this function should square any number but instead we're going to get an error
-
-// =============> write your prediction of the error here
-
-function square(3) {
-    return num * num;
-}
-
-// =============> write the error message here
-
-// =============> explain this error message here
-
-// Finally, correct the code to fix the problem
-
-// =============> write your new code here
-
-
+// Predict and explain first BEFORE you run any code...
+
+// this function should square any number but instead we're going to get an error
+
+// I predict the error will come from the argument because when we write a function we first declare parameters not values
+
+/*function square(3) {
+    return num * num;
+}*/
+
+// SyntaxError: Unexpected number
+
+// this error tells us javascript expects valid variable identifiers when function is defined not values
+
+// Finally, correct the code to fix the problem
+
+// Here is the fixed code
+function square(num) {
+  return num * num;
+}
+console.log(square(3));
diff --git a/Sprint-3/2-mandatory-debug/0.js b/Sprint-3/2-mandatory-debug/0.js
index b27511b41..50c37d9ea 100644
--- a/Sprint-3/2-mandatory-debug/0.js
+++ b/Sprint-3/2-mandatory-debug/0.js
@@ -1,14 +1,22 @@
-// Predict and explain first...
-
-// =============> write your prediction here
-
-function multiply(a, b) {
-  console.log(a * b);
-}
-
-console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
-
-// =============> write your explanation here
-
-// Finally, correct the code to fix the problem
-//  =============> write your new code here
+// Predict and explain first...
+
+// I predict the code will run normally and print the result of a * b on the first console, but it will return undefined on the
+// second console.log
+
+/*function multiply(a, b) {
+  console.log(a * b);
+}
+
+console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);*/
+
+// The reason for printing undefined is that we didn't define a return value so the js doesn't know what to return and it simply returns undefined
+// We can fix the code by replacing the console.log with a return keyword so the js knows what to return when the function is called
+
+// Finally, correct the code to fix the problem
+// Here is the fixed code
+
+function multiply(a, b) {
+  return a * b;
+}
+
+console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
diff --git a/Sprint-3/2-mandatory-debug/1.js b/Sprint-3/2-mandatory-debug/1.js
index 37cedfbcf..d5c63b0e5 100644
--- a/Sprint-3/2-mandatory-debug/1.js
+++ b/Sprint-3/2-mandatory-debug/1.js
@@ -1,13 +1,21 @@
-// Predict and explain first...
-//  =============> write your prediction here
-
-function sum(a, b) {
-  return;
-  a + b;
-}
-
-console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
-
-// =============> write your explanation here
-// Finally, correct the code to fix the problem
-//  =============> write your new code here
+// Predict and explain first...
+//  I predict that the code will run but it will print undefined because the return expression is not setup properly
+
+/*function sum(a, b) {
+  return;
+  a + b;
+}
+
+console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);*/
+
+// When we run the code it printed out undefined because the return keyword is there but the expression that needs to be returned is not on the same line
+// therefore the return keyword can't reach the expression and the expression is ignored because the function has done execution right after it reaches the return keyword
+
+// Finally, correct the code to fix the problem
+// Here is the fixed code
+
+function sum(a, b) {
+  return a + b;
+}
+
+console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
diff --git a/Sprint-3/2-mandatory-debug/2.js b/Sprint-3/2-mandatory-debug/2.js
index 57d3f5dc3..d3eff7d84 100644
--- a/Sprint-3/2-mandatory-debug/2.js
+++ b/Sprint-3/2-mandatory-debug/2.js
@@ -1,24 +1,36 @@
-// Predict and explain first...
-
-// Predict the output of the following code:
-// =============> Write your prediction here
-
-const num = 103;
-
-function getLastDigit() {
-  return num.toString().slice(-1);
-}
-
-console.log(`The last digit of 42 is ${getLastDigit(42)}`);
-console.log(`The last digit of 105 is ${getLastDigit(105)}`);
-console.log(`The last digit of 806 is ${getLastDigit(806)}`);
-
-// Now run the code and compare the output to your prediction
-// =============> write the output here
-// Explain why the output is the way it is
-// =============> write your explanation here
-// Finally, correct the code to fix the problem
-// =============> write your new code here
-
-// This program should tell the user the last digit of each number.
-// Explain why getLastDigit is not working properly - correct the problem
+// Predict and explain first...
+
+// Predict the output of the following code:
+// I predict the code will run but will give us unexpected output as the function does not have parameter but we provided an argument
+
+/*const num = 103;
+
+function getLastDigit() {
+  return num.toString().slice(-1);
+}
+
+console.log(`The last digit of 42 is ${getLastDigit(42)}`);
+console.log(`The last digit of 105 is ${getLastDigit(105)}`);
+console.log(`The last digit of 806 is ${getLastDigit(806)}`);*/
+
+// Now run the code and compare the output to your prediction
+// The last digit of 42 is 3
+// The last digit of 105 is 3
+// The last digit of 806 is 3
+
+// Explain why the output is the way it is
+// It is because we declared a function with no parameters so the function will ignore any arguments we provide
+// since the var num is declared and assigned with a value so every time the function is called it will use the var num
+
+// Finally, correct the code to fix the problem
+// Here is the fixed code
+function getLastDigit(num) {
+  return num.toString().slice(-1);
+}
+
+console.log(`The last digit of 42 is ${getLastDigit(42)}`);
+console.log(`The last digit of 105 is ${getLastDigit(105)}`);
+console.log(`The last digit of 806 is ${getLastDigit(806)}`);
+
+// This program should tell the user the last digit of each number.
+// Explain why getLastDigit is not working properly - correct the problem
diff --git a/Sprint-3/3-mandatory-implement/1-bmi.js b/Sprint-3/3-mandatory-implement/1-bmi.js
index 58b1085f1..b95e97ba2 100644
--- a/Sprint-3/3-mandatory-implement/1-bmi.js
+++ b/Sprint-3/3-mandatory-implement/1-bmi.js
@@ -1,19 +1,23 @@
-// Below are the steps for how BMI is calculated
-
-// The BMI calculation divides an adult's weight in kilograms (kg) by their height in metres (m) squared.
-
-// For example, if you weigh 70kg (around 11 stone) and are 1.73m (around 5 feet 8 inches) tall, you work out your BMI by:
-
-// squaring your height: 1.73 x 1.73 = 2.99
-// dividing 70 by 2.99 = 23.41
-// Your result will be displayed to 1 decimal place, for example '23.4'.
-
-// You will need to implement a function that calculates the BMI of someone based off their weight and height
-
-// Given someone's weight in kg and height in metres
-// Then when we call this function with the weight and height
-// It should return a string of their Body Mass Index to 1 decimal place
-
-function calculateBMI(weight, height) {
-  // return the BMI of someone based off their weight and height
-}
+// Below are the steps for how BMI is calculated
+
+// The BMI calculation divides an adult's weight in kilograms (kg) by their height in metres (m) squared.
+
+// For example, if you weigh 70kg (around 11 stone) and are 1.73m (around 5 feet 8 inches) tall, you work out your BMI by:
+
+// squaring your height: 1.73 x 1.73 = 2.99
+// dividing 70 by 2.99 = 23.41
+// Your result will be displayed to 1 decimal place, for example '23.4'.
+
+// You will need to implement a function that calculates the BMI of someone based off their weight and height
+
+// Given someone's weight in kg and height in metres
+// Then when we call this function with the weight and height
+// It should return a string of their Body Mass Index to 1 decimal place
+
+function calculateBMI(weight, height) {
+  const BMI = weight / height ** 2;
+  const stringBMI = BMI.toString();
+  return stringBMI.slice(0, stringBMI.indexOf(".") + 2);
+}
+
+console.log(calculateBMI(70, 1.73));
diff --git a/Sprint-3/3-mandatory-implement/2-cases.js b/Sprint-3/3-mandatory-implement/2-cases.js
index 5b0ef77ad..c820144df 100644
--- a/Sprint-3/3-mandatory-implement/2-cases.js
+++ b/Sprint-3/3-mandatory-implement/2-cases.js
@@ -1,16 +1,20 @@
-// A set of words can be grouped together in different cases.
-
-// For example, "hello there" in snake case would be written "hello_there"
-// UPPER_SNAKE_CASE means taking a string and writing it in all caps with underscores instead of spaces.
-
-// Implement a function that:
-
-// Given a string input like "hello there"
-// When we call this function with the input string
-// it returns the string in UPPER_SNAKE_CASE, so "HELLO_THERE"
-
-// Another example: "lord of the rings" should be "LORD_OF_THE_RINGS"
-
-// You will need to come up with an appropriate name for the function
-// Use the MDN string documentation to help you find a solution
-// This might help https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/toUpperCase
+// A set of words can be grouped together in different cases.
+
+// For example, "hello there" in snake case would be written "hello_there"
+// UPPER_SNAKE_CASE means taking a string and writing it in all caps with underscores instead of spaces.
+
+// Implement a function that:
+
+// Given a string input like "hello there"
+// When we call this function with the input string
+// it returns the string in UPPER_SNAKE_CASE, so "HELLO_THERE"
+
+// Another example: "lord of the rings" should be "LORD_OF_THE_RINGS"
+
+// You will need to come up with an appropriate name for the function
+// Use the MDN string documentation to help you find a solution
+// This might help https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/toUpperCase
+function uppercaseAndUnderscore(word) {
+  return word.toUpperCase().replaceAll(" ", "_");
+}
+console.log(uppercaseAndUnderscore("welcome to cyf"));
diff --git a/Sprint-3/3-mandatory-implement/3-to-pounds.js b/Sprint-3/3-mandatory-implement/3-to-pounds.js
index 10754da73..000b99a2d 100644
--- a/Sprint-3/3-mandatory-implement/3-to-pounds.js
+++ b/Sprint-3/3-mandatory-implement/3-to-pounds.js
@@ -1,6 +1,25 @@
-// In Sprint-1, there is a program written in 3-mandatory-interpret/3-to-pounds.js
-
-// You will need to take this code and turn it into a reusable block of code.
-// You will need to declare a function called toPounds with an appropriately named parameter.
-
-// You should call this function a number of times to check it works for different inputs
+// In Sprint-1, there is a program written in 3-mandatory-interpret/3-to-pounds.js
+
+// You will need to take this code and turn it into a reusable block of code.
+// You will need to declare a function called toPounds with an appropriately named parameter.
+
+// You should call this function a number of times to check it works for different inputs
+
+function toPounds(penceString) {
+  if (penceString == "") {
+    return "please put the amount";
+  }
+  const totalPence = parseInt(penceString, 10);
+  const pounds = totalPence / 100;
+  const formattedPound = pounds.toFixed(2);
+  return "£" + formattedPound;
+}
+
+console.log(toPounds("1991p"));
+console.log(toPounds("2020p"));
+console.log(toPounds("399p"));
+console.log(toPounds("69p"));
+console.log(toPounds("00p  "));
+console.log(toPounds(" 50p "));
+console.log(toPounds("232423"));
+console.log(toPounds(""));
diff --git a/Sprint-3/4-mandatory-interpret/time-format.js b/Sprint-3/4-mandatory-interpret/time-format.js
index c0dd9c9a5..027d3d473 100644
--- a/Sprint-3/4-mandatory-interpret/time-format.js
+++ b/Sprint-3/4-mandatory-interpret/time-format.js
@@ -1,38 +1,45 @@
-function pad(num) {
-  let numString = num.toString();
-  while (numString.length < 2) {
-    numString = "0" + numString;
-  }
-  return numString;
-}
-
-function formatTimeDisplay(seconds) {
-  const remainingSeconds = seconds % 60;
-  const totalMinutes = (seconds - remainingSeconds) / 60;
-  const remainingMinutes = totalMinutes % 60;
-  const totalHours = (totalMinutes - remainingMinutes) / 60;
-
-  return `${pad(totalHours)}:${pad(remainingMinutes)}:${pad(remainingSeconds)}`;
-}
-
-// You will need to play computer with this example - use the Python Visualiser https://pythontutor.com/visualize.html#mode=edit
-// to help you answer these questions
-
-// Questions
-
-// a) When formatTimeDisplay is called how many times will pad be called?
-// =============> write your answer here
-
-// Call formatTimeDisplay with an input of 61, now answer the following:
-
-// b) What is the value assigned to num when pad is called for the first time?
-// =============> write your answer here
-
-// c) What is the return value of pad when it is called for the first time?
-// =============> write your answer here
-
-// d) What is the value assigned to num when pad is called for the last time in this program?  Explain your answer
-// =============> write your answer here
-
-// e) What is the return value of pad when it is called for the last time in this program?  Explain your answer
-// =============> write your answer here
+function pad(num) {
+  let numString = num.toString();
+  while (numString.length < 2) {
+    numString = "0" + numString;
+  }
+  return numString;
+}
+
+function formatTimeDisplay(seconds) {
+  const remainingSeconds = seconds % 60;
+  const totalMinutes = (seconds - remainingSeconds) / 60;
+  const remainingMinutes = totalMinutes % 60;
+  const totalHours = (totalMinutes - remainingMinutes) / 60;
+
+  return `${pad(totalHours)}:${pad(remainingMinutes)}:${pad(remainingSeconds)}`;
+}
+
+console.log(formatTimeDisplay(61));
+
+// You will need to play computer with this example - use the Python Visualiser https://pythontutor.com/visualize.html#mode=edit
+// to help you answer these questions
+
+// Questions
+
+// a) When formatTimeDisplay is called how many times will pad be called?
+// The function pad will be called three times
+
+// Call formatTimeDisplay with an input of 61, now answer the following:
+
+// b) What is the value assigned to num when pad is called for the first time?
+//  num is assigned value of totalHours when pad is called first time because js evaluates expressions from left to right
+// Therefore num will be assigned with 0 when it is called for the first time
+
+// c) What is the return value of pad when it is called for the first time?
+// The return value will be "00"
+
+// d) What is the value assigned to num when pad is called for the last time in this program?  Explain your answer
+// num will be assigned the value of remainingSeconds when pad is called for the last time because js evaluates any expression
+// from left to right and the pad with argument remainingSeconds is found at the right end
+// Therefore num will be assigned with 1 when it is called for the last time
+
+// e) What is the return value of pad when it is called for the last time in this program?  Explain your answer
+// The return value of pad when it is called for the last time is "01"
+// We calculated remainingSeconds in the function formatTimeDisplay and we got the value 1 then when pad is called with
+// an argument value of remainingSeconds we changed the value to string and 0 is added before 1 and it became 2 digits which is "01"
diff --git a/Sprint-3/5-stretch-extend/format-time.js b/Sprint-3/5-stretch-extend/format-time.js
index 32a32e66b..beda57c17 100644
--- a/Sprint-3/5-stretch-extend/format-time.js
+++ b/Sprint-3/5-stretch-extend/format-time.js
@@ -1,25 +1,137 @@
-// This is the latest solution to the problem from the prep.
-// Make sure to do the prep before you do the coursework
-// Your task is to write tests for as many different groups of input data or edge cases as you can, and fix any bugs you find.
-
-function formatAs12HourClock(time) {
-  const hours = Number(time.slice(0, 2));
-  if (hours > 12) {
-    return `${hours - 12}:00 pm`;
-  }
-  return `${time} am`;
-}
-
-const currentOutput = formatAs12HourClock("08:00");
-const targetOutput = "08:00 am";
-console.assert(
-  currentOutput === targetOutput,
-  `current output: ${currentOutput}, target output: ${targetOutput}`
-);
-
-const currentOutput2 = formatAs12HourClock("23:00");
-const targetOutput2 = "11:00 pm";
-console.assert(
-  currentOutput2 === targetOutput2,
-  `current output: ${currentOutput2}, target output: ${targetOutput2}`
-);
+// This is the latest solution to the problem from the prep.
+// Make sure to do the prep before you do the coursework
+// Your task is to write tests for as many different groups of input data or edge cases as you can, and fix any bugs you find.
+
+function formatAs12HourClock(time) {
+  const slicedHours = time.slice(0, 2);
+  const hours = Number(slicedHours);
+  const slicedMinutes = time.slice(-2);
+  const minutes = Number(slicedMinutes);
+  const pattern = /^\d{2}:\d{2}$/;
+  if (!pattern.test(time)) {
+    return `wrong format input`;
+  }
+  if (minutes < 60) {
+    if (hours >= 24) {
+      return `please check your input hour`;
+    } else if (hours > 12 && hours <= 21) {
+      return `0${hours - 12}:${slicedMinutes} pm`;
+    } else if (hours > 21) {
+      return `${hours - 12}:${slicedMinutes} pm`;
+    } else if (hours === 0) {
+      return `12:${slicedMinutes} am`;
+    } else if (hours === 12) {
+      return `12:${slicedMinutes} pm`;
+    } else {
+      return `${slicedHours}:${slicedMinutes} am`;
+    }
+  } else {
+    return `please check your input minute`;
+  }
+}
+
+const currentOutput1 = formatAs12HourClock("00:00");
+const targetOutput1 = "12:00 am";
+console.assert(
+  currentOutput1 === targetOutput1,
+  `current output: ${currentOutput1}, target output: ${targetOutput1}`,
+  "dude whats wrong",
+);
+
+const currentOutput2 = formatAs12HourClock("13:00");
+const targetOutput2 = "01:00 pm";
+console.assert(
+  currentOutput2 === targetOutput2,
+  `current output: ${currentOutput2}, target output: ${targetOutput2}`,
+  "dude whats wrong",
+);
+
+const currentOutput3 = formatAs12HourClock("21:00");
+const targetOutput3 = "09:00 pm";
+console.assert(
+  currentOutput3 === targetOutput3,
+  `current output: ${currentOutput3}, target output: ${targetOutput3}`,
+  "dude whats wrong",
+);
+
+const currentOutput4 = formatAs12HourClock("22:00");
+const targetOutput4 = "10:00 pm";
+console.assert(
+  currentOutput4 === targetOutput4,
+  `current output: ${currentOutput4}, target output: ${targetOutput4}`,
+  "dude whats wrong",
+);
+
+const currentOutput5 = formatAs12HourClock("23:59");
+const targetOutput5 = "11:59 pm";
+console.assert(
+  currentOutput5 === targetOutput5,
+  `current output: ${currentOutput5}, target output: ${targetOutput5}`,
+  "dude whats wrong",
+);
+
+const currentOutput6 = formatAs12HourClock("12:60");
+const targetOutput6 = "please check your input minute";
+console.assert(
+  currentOutput6 === targetOutput6,
+  `current output: ${currentOutput6}, target output: ${targetOutput6}`,
+  "dude whats wrong",
+);
+
+const currentOutput7 = formatAs12HourClock("24:00");
+const targetOutput7 = "please check your input hour";
+console.assert(
+  currentOutput7 === targetOutput7,
+  `current output: ${currentOutput7}, target output: ${targetOutput7}`,
+  "dude whats wrong",
+);
+
+const currentOutput8 = formatAs12HourClock("100:00");
+const targetOutput8 = "wrong format input";
+console.assert(
+  currentOutput8 === targetOutput8,
+  `current output: ${currentOutput8}, target output: ${targetOutput8}`,
+  "dude whats wrong",
+);
+
+const currentOutput9 = formatAs12HourClock("0:00");
+const targetOutput9 = "wrong format input";
+console.assert(
+  currentOutput9 === targetOutput9,
+  `current output: ${currentOutput9}, target output: ${targetOutput9}`,
+  "dude whats wrong",
+);
+
+const currentOutput10 = formatAs12HourClock("tt:00");
+const targetOutput10 = "wrong format input";
+console.assert(
+  currentOutput10 === targetOutput10,
+  `current output: ${currentOutput10}, target output: ${targetOutput10}`,
+  "dude whats wrong",
+);
+
+console.log(formatAs12HourClock("00:00"));
+console.log(formatAs12HourClock("12:00"));
+console.log(formatAs12HourClock("13:00"));
+console.log(formatAs12HourClock("21:00"));
+console.log(formatAs12HourClock("22:00"));
+console.log(formatAs12HourClock("23:59"));
+console.log(formatAs12HourClock("12:60"));
+console.log(formatAs12HourClock("24:00"));
+console.log(formatAs12HourClock("100:00"));
+console.log(formatAs12HourClock("0:00"));
+console.log(formatAs12HourClock("tt:00"));
+
+// /^\d{2}:\d{2}$/ so this is regular expression or regex I used them to validate the input time format
+// it is enclosed with /.../ telling the JS it is regular expression
+// ^ this means check from the start of the string
+// \d this refers single digit from 0 to 9
+// {2} means two times (\d{2} .....two single digits)
+// : simply checks with :
+// the same like before \d{2} checks two single digits
+// $ checking ends
+
+// I preferred this because it will strictly check the format of the input with the desired input format
+// so that the following process will continue with out error, and it saves a lot of time
+
+// It is rigid and does not check the value ....it only checks the format