Arrays & Lists

JavaScript Program to Flatten Nested Array

Flatten arrays of arbitrary nesting depth into a single linear array using recursion, reduce, and modern flat() methods.

JavaScript Source Code

Editable code sample with line numbers

JavaScript

Expected Output

When this program is compiled and executed, the terminal outputs:

Original: [1,[2,[3,4],5],[[6]],7,[8,[9,[10]]]]
flattenCustom: [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ]
flattenReduce: [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ]
Array.flat(Infinity): [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ]

How the Code Works

Array flattening processes multi-dimensional nested arrays into a single-dimension output. 1. The recursive function inspects each element with Array.isArray(). If an element is an array, it recursively flattens it and spreads the values into the result buffer. 2. The modern native Array.prototype.flat(Infinity) flattens nested arrays to unlimited depth natively in V8.

Time Complexity

O(N) where N is total items across all dimensions

Space Complexity

O(D) call stack where D is maximum nesting depth

Key Takeaways & Best Practices

Array.isArray() is the safest method to detect nested arrays in JavaScript.
Array.prototype.flat(Infinity) is available in all modern browsers and Node.js.

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View Code

Original: [1,[2,[3,4],5],[[6]],7,[8,[9,[10]]]] flattenCustom: [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ] flattenReduce: [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ] Array.flat(Infinity): [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ]

How the Code Works

Time Complexity

O(N) where N is total items across all dimensions

Space Complexity

O(D) call stack where D is maximum nesting depth

Key Takeaways & Best Practices

Array.isArray() is the safest method to detect nested arrays in JavaScript.
Array.prototype.flat(Infinity) is available in all modern browsers and Node.js.

JavaScript Program to Flatten Nested Array

JavaScript Source Code

Expected Output

How the Code Works

Key Takeaways & Best Practices

Master JavaScript with ZenCompiler

Related JavaScript Examples

JavaScript LRU Cache (Least Recently Used)

JavaScript Valid Parentheses (Stack Algorithm)

JavaScript Program to Reverse a String

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JavaScript Program to Flatten Nested Array

JavaScript Source Code

Expected Output

How the Code Works

Key Takeaways & Best Practices

Master JavaScript with ZenCompiler

Related JavaScript Examples

JavaScript LRU Cache (Least Recently Used)

JavaScript Valid Parentheses (Stack Algorithm)

JavaScript Program to Reverse a String