Why does `Array.length`, `Function.length`, `String.length`, etc return 1?
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zealoushacker
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Published on 2012-10-30T20:45:49Z
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2012/10/30
23:01 UTC
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JavaScript
While teaching my JavaScript class yesterday, my students and I came across some interesting functionality that I thought might be worth capturing in a question and the answer I've come to.
Typing Array.length
in the JS console in chrome returns 1
.
Likewise, Function.length
returns 1
. This is important because:
Every function in JavaScript is actually a Function object. (MDN JS Ref: Function)
Thus, Object.length
and likely all other native objects will and should return 1
as the value of the length
property.
So, finally why is this behavior occurring?
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