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Why does Array.filter(Number) filter zero out in JavaScript?

Prickly Petrel answered on January 18, 2024 Popularity 1/10 Helpfulness 1/10

answer Why does Array.filter(Number) filter zero out in JavaScript?

Why does Array.filter(Number) filter zero out in JavaScript?

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// I'm trying to filter all non-numeric elements out from an array. We can see the desired output when using typeof. But with Number, it filters zero out.
// Here's the example (tested in Chrome Console):

[-1, 0, 1, 2, 3, 4, Number(0), '', 'test'].filter(Number)
// Which output with zero filtered out:
[-1, 1, 2, 3, 4]  // 0 is filtered
// If we use typeof, it doesn't filter zero, which was expected.

// code
[-1, 0, 1, 2, 3, 4, Number(0), '', 'test'].filter(n => typeof n === 'number')
// output
[-1, 0, 1, 2, 3, 4, 0]

Popularity 1/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: filter javascript out zero

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Contributed on Jan 18 2024

Prickly Petrel

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Why does Array.filter(Number) filter zero out in JavaScript?

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Why does Array.filter(Number) filter zero out in JavaScript?

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