JavaScript Array Tricks
Arrays are one of the most common data types in JavaScript. While there are many libraries that deal with them, here are some awesome tips and tricks you can leverage in your code without adding any external dependencies.
Unique values in array
JavaScript, Array
Finds all unique values in an array.
Compact array
JavaScript, Array
Removes falsy values from an array.
Test if any array element is truthy
JavaScript, Array
Checks if the provided predicate function returns
truefor at least one element in a collection.Test if all array elements are truthy
JavaScript, Array
Checks if the provided predicate function returns
truefor all elements in a collection.Test if all array elements are falsy
JavaScript, Array
Checks if the provided predicate function returns
falsefor all elements in a collection.Array difference
JavaScript, Array
Calculates the difference between two arrays, without filtering duplicate values.
Array union
JavaScript, Array
Returns every element that exists in any of the two arrays at least once.
Array intersection
JavaScript, Array
Returns the elements that exist in both arrays, filtering duplicate values.
Head of array
JavaScript, Array
Returns the head of an array.
Array tail
JavaScript, Array
Returns all elements in an array except for the first one.
Last array element
JavaScript, Array
Returns the last element in an array.
Flatten array
JavaScript, Array
Flattens an array up to the specified depth.