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Commit cf0547b

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Challenge 21 & 22 Added
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‎README.md

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[Solution Explanation](./solutions/ch_20_Check_String_Url/readme.md)
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## Challenge 21: Validate Username
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Write a function that checks if a given string is a valid username. A valid username should contain only alphanumeric characters and underscores, and should be between 4 and 16 characters long.
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Write a function called `isValidUsername` that takes a string `username` in its parameter and returns true or false.
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[Solution Explanation](./solutions/ch_21_Validate_Username/readme.md)
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## Challenge 22: Check Leap Year
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Write a function that checks if a given year is a leap year.
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Write a function called `isLeapYear` that takes `year` in its parameter and returns true or false.
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[Solution Explanation](./solutions/ch_22_Check_Leap_Year/readme.md)
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<!-- Add new challenges before this comment -->
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## Contributors
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// Function to validate username
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function isValidUsername(username) {
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// Regular expression pattern for username validation
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const regex = /^[a-zA-Z0-9_]{4,16}$/;
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// Test if the string matches the username pattern
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return regex.test(username);
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}
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# Challenge 21: Validate Username
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Write a function that checks if a given string is a valid username. A valid username should contain only alphanumeric characters and underscores, and should be between 4 and 16 characters long.
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Write a function called `isValidUsername` that takes a string `username` in its parameter and returns true or false.
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## Answer
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```javascript
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// Function to validate username
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function isValidUsername(username) {
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// Regular expression pattern for username validation
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const regex = /^[a-zA-Z0-9_]{4,16}$/;
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// Test if the string matches the username pattern
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return regex.test(username);
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}
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```
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## Answer Explanation
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The `isValidUsername` function takes a string as input and uses a regular expression to check if it's a valid username. The regular expression `^[a-zA-Z0-9_]{4,16}$` is used to match the username pattern.
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The test method is then used to check if the input string matches the regular expression, if it's a valid username function returns true otherwise false.
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// Function to check leap year
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function isLeapYear(year) {
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// Gregorian calendar rule to check leap year
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if ((year % 4 === 0 && year % 100 !== 0) || year % 400 === 0) {
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return true;
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}
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return false;
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}
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# Challenge 22: Check Leap Year
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Write a function that checks if a given year is a leap year.
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Write a function called `isLeapYear` that takes `year` in its parameter and returns true or false.
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## Answer
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```javascript
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// Function to check leap year
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function isLeapYear(year) {
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// Gregorian calendar rule to check leap year
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if ((year % 4 === 0 && year % 100 !== 0) || year % 400 === 0) {
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return true;
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}
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return false;
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}
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```
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## Answer Explanation
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The `isLeapYear` function takes `year` as input and check condition for leap year. if condition is satisfied returns true otherwise false.

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