Question 354551 in Javascript Question posted in
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Javascript – Why 123['toString'].length returns 1?

console.log(123['toString'].length);

why this code returns value: 1 ?

Any good explanation?

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2

Answers


  1. 0

    Its the expected number of parameters of the toString function.

    https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/length

    The statement is interpreted like this:

    123  => number
['toString'] => function toString of number
.length => length property of the function
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  2. 0

    Because in javascript the length of a function is the number of named arguments it accepts.

    Your 123['toString'] returns the toString method of numbers which accepts a radix parameter (see Number.prototype.toString), so that is what 1 is for.

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