I have downloaded a javascript script and one of the first line is :
qq = qq || {};
What does it mean?
I have downloaded a javascript script and one of the first line is :
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I have downloaded a javascript script and one of the first line is :
qq = qq || {};
What does it mean?
It checks
qqfor a pre-existing truthy value or else (||) sets it as an empty object ({}).In essence, it’s purpose is to quickly ensure that any further references to qq will not be undefined, so you can check for properties of the object without your script breaking due to the fact that the variable isn’t even a valid object in the first place.