Over 50 JavaScript Coding Examples and Useful Code Snippets

JavaScript Helpful Code Snippets

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Write a function that reverses a string in JavaScript.
Write a function that checks whether a given string is a palindrome in JavaScript.
Write a function that returns the factorial of a given number in JavaScript.
Write a function that finds the largest number in an array in JavaScript.
Write a function that sorts an array of numbers in ascending order in JavaScript.
Write a function that calculates the sum of all numbers in an array in JavaScript.
Write a function that returns a new array with all duplicate values removed in JavaScript.
Write a function that returns the nth Fibonacci number in JavaScript.
Write a function that checks whether a given number is prime in JavaScript.
Write a function that removes all falsy values (false, null, 0, “”, undefined, and NaN) from an array in JavaScript.

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Write a function that checks whether two given strings are anagrams in JavaScript.

Write a function that calculates the average of all numbers in an array in JavaScript.

Write a function that converts a string to title case (i.e., the first letter of each word capitalized) in JavaScript.

Write a function that returns the number of vowels in a given string in JavaScript.

Write a function that calculates the factorial of a given number without using recursion in JavaScript.

Write a function that returns the second largest number in an array in JavaScript.

Write a function that checks whether a given string is a pangram (i.e., contains all letters of the alphabet) in JavaScript.

Write a function that calculates the sum of all even numbers in an array in

Write a function that checks whether a given number is a perfect square (i.e., the square of an integer) in JavaScript.

Write a function that converts a temperature in Fahrenheit to Celsius in JavaScript.

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Write a function that removes all duplicate elements from an array in JavaScript.

Write a function that calculates the nth Fibonacci number in JavaScript.

Write a function that returns the maximum value in an array without using the Math.max() method in JavaScript.

Write a function that checks whether a given string is a palindrome (i.e., reads the same backwards and forwards) in JavaScript.

Write a function that returns the first non-repeated character in a given string in JavaScript.

Write a function that generates a random string of a given length in JavaScript.

Write a function that sorts an array of objects by a specified key in JavaScript.

Write a function that flattens a nested array of any depth in JavaScript.

Write a function that finds the common elements between two arrays in JavaScript.

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Write a function that converts a string to title case (i.e., capitalizes the first letter of each word) in JavaScript.

Write a function that calculates the sum of all digits in a given integer in JavaScript.

Write a function that removes all whitespace from a given string in JavaScript.

Write a function that checks whether a given year is a leap year in JavaScript.

Write a function that returns the factorial of a given number in JavaScript.

Write a function that removes duplicates from an array in JavaScript.

Write a function that converts a number to a string with commas separating thousands in JavaScript.

Write a function that removes the first occurrence of a specified element from an array in JavaScript.

Write a function that returns the last n elements of an array in JavaScript.

Write a function that generates a random alphanumeric string of a specified length in JavaScript.

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Write a function that converts a number to a string with commas separating thousands in JavaScript.

Write a function that removes the first occurrence of a specified element from an array in JavaScript.

Write a function that returns the last n elements of an array in JavaScript.

Write a function that generates a random alphanumeric string of a specified length in JavaScript.

Write a function that returns the sum of all numbers in an array in JavaScript.

Write a function that sorts an array of objects by a specified property in JavaScript.

Write a function that returns the longest word in a string in JavaScript.

Write a function that converts a string to title case (i.e., capitalizes the first letter of each word) in JavaScript.

Write a function that returns the number of occurrences of a specified element in an array in JavaScript.

Write a function that checks whether a given string is a palindrome (i.e., reads the same forwards and backwards) in JavaScript.

Write a function that finds the first non-repeating character in a string in JavaScript.