Skip to content
JavaScript

Array Flattening

Flatten a multi-dimensional array into one dimension.

By EZ4Code Team
arrayflatten

Code

function flatten(arr, depth = Infinity) {
  return arr.reduce((acc, val) =>
    Array.isArray(val) && depth > 0
      ? acc.concat(flatten(val, depth - 1))
      : acc.concat(val),
    []
  );
}

// Using native flat
const flat = arr => arr.flat(Infinity);

Explanation

Recursively flattens or uses the native flat method for arbitrary depth.

More JavaScript Snippets

Array Map Filter Reduce

Chain map, filter, reduce, find, some, and every on arrays.

Array Deduplication

Deduplicate an array using Set.

Deep Clone

Deep clone objects, supporting common data types.

Debounce Function

Wait a period of time after an event triggers before executing; reset the timer if triggered again during the wait.

Throttle Function

Limit a function to execute at most once within a time interval.

Promise.all Concurrency Control

A Promise executor with concurrency limit.