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What happens if you assign a variable without a keyword?

What happens if you assign a variable without a keyword?


Asked On2019-10-13 02:38:18 by:arunwebber

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What if you define a variable without using a keyword at all? Technically, if x hasn’t already been defined, then x = 1 is shorthand for window.x = 1.  it’s a common cause of memory leaks. 

To prevent this shorthand altogether, you can use strict mode — introduced in ES5 — by writing use strict at the top of your document or a particular function. Then, when you try to declare a variable without a keyword, you’ll get an error: Uncaught SyntaxError: Unexpected identifier

Answerd on:2019-10-13 Answerd By:arunwebber

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