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Home/ Questions/Q 7074011
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Editorial Team
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Editorial Team
Asked: May 28, 20262026-05-28T05:59:56+00:00 2026-05-28T05:59:56+00:00

Why are Javascript bookmarklets wrapped in closures? I wouldn’t think someone would put an

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Why are Javascript bookmarklets wrapped in closures?
I wouldn’t think someone would put an unnamed function in there for no reason.

I have read quite a few explanations on closures, but I still don’t feel that i’ve grasped the whole concept.

Thanks guys!

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  1. Editorial Team
    Editorial Team
    2026-05-28T05:59:56+00:00Added an answer on May 28, 2026 at 5:59 am

    To not contaminate the global scope by executing a function after creation.

    (function(){var x=10; })()
    alert(window.x) // undefined
    
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