Fails both on chrome and node 8.x
["4", "5"].map(x => parseInt(x)) // [4, 5]
["4", "5"].map(parseInt) // [4, NaN]
WHAT?
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eavichay
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2Alternative: `.map(Number)` – Cerbrus Sep 27 '17 at 15:16
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1This is behaving properly, exactly as documented. See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/parseInt – jamison Sep 27 '17 at 15:17
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works fine with .map(parseFloat) – AngelSalazar Sep 27 '17 at 15:17
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@AngelSalazar: Because `parseFloat` only accepts 1 parameter. – Cerbrus Sep 27 '17 at 15:18
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Re-open voter: Why? This is an exact duplicate. – Cerbrus Sep 27 '17 at 15:18
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parseInt accepts a second argument (and integer that specifies the radix/base), and map provides its callback a second argument - the array index. – jamison Sep 27 '17 at 15:19
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It is a duplicate, thanks – eavichay Sep 27 '17 at 15:19
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1I see, basically parseInt gets the number and the index from map – AngelSalazar Sep 27 '17 at 15:19
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Yup, precisely! – jamison Sep 27 '17 at 15:20