{}" in Javascript

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What does “options = options || {}” mean in Javascript? [duplicate] 5 answers

What does “var FOO = FOO || {}” (assign a variable or an empty object to that variable) mean in Javascript? 7 answers

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In browsers, the window object is global.

If $N is falsy, {} will be assigned to window.$N . If $N is truthy, its value will be assigned to window.$N (keeping the same value probably).

This is a common way to override default values.

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