Why the output is 2???

Question

var arr = ["","",];
alert(arr.length)
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There are two strings in the array but 1 number which is not in quotation marks. There are two commas it means three items can be added.
David Carroll , bobbie

Answer 1

Tahir Usman Trailing commas in arrays are ignored in Javascript.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Trailing_commas

Answer 2

It is arr.length asking for the length not for index💧 Alex Tusinean 🔥

Answer 3

Thank you David Carroll

Answer 4

💧 Alex Tusinean 🔥 not quite. See David Carroll 's answer.