How to use `flat()` and flatten an array with the depth of one?

const numbers = [1, 2, [3, 4], [5, 6]]

// returns [1, 2, 3, 4, 5, 6]
numbers.flat()
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April 12th, 2020

# flat() - Flatten an array

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flat() can be used to flatten arrays with the depth of one (e.g. [1, [2, 3], 4]). It returns a new array.

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