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Home/ Questions/Q 7368297
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Editorial Team
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Editorial Team
Asked: May 29, 20262026-05-29T03:38:58+00:00 2026-05-29T03:38:58+00:00

var a = words; a instanceOf String; #=> false I can’t understand how this

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var a = "words";
a instanceOf String;    
#=> false

I can’t understand how this code snippet works.

  • Is instanceof a method of a, or of this which locates it in the default scope?
  • If String here is a parameter passed to instanceof, how come it doesn’t have parentheses?
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  1. Editorial Team
    Editorial Team
    2026-05-29T03:38:58+00:00Added an answer on May 29, 2026 at 3:38 am

    instanceof is an operator, so it’s more like + than a function.

    See: https://developer.mozilla.org/en/JavaScript/Reference/Operators/instanceof

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