Javascript Basics

Return the percentage of a number

Check if a number is even

How many times does a character occur?

Check if a number is a whole number

Multiplication, division, and comparison operators

Check whether a string contains another string and concatenate

Split a number into its digits

Clear up the chaos behind these strings

Return the next higher prime number

Find next higher natural number that is divisble by y

Round a number to 2 decimal places

Comparison operators, strict equality

Find the correct word by incrementing letters in alphabet
Javascript Arrays

Check if all array elements are equal

Sort an array of numbers in descending order

Sort an array of strings alphabetically

Return the average of an array of numbers

Return the longest string from an array of strings

Merge an arbitrary number of arrays

Remove a specific array element

Merge two arrays with duplicate values

Sum up all array elements with values greater than

Create a range of numbers

Return last n array elements

Group array of strings by first letter.

Define an array with conditional elements
Javascript Objects

Accessing object properties one

Accessing object properties two

Accessing object properties three

Remove a property from an object

Merge two objects with matching keys

Swap object keys and values

Replace empty strings in object with null values

Extracting information from objects

Add property to each object in array
Javascript Dates

Check if two dates are equal

Return the number of days between two dates

Check if two dates fall on the exact same day

Check if two dates are within 1 hour from each other

Check if one date is earlier than another

Add n days to an existing date

Calculate difference between two dates in hours, minutes, and seconds

Return the next nearest quarter hour of a date