Possible Duplicate:
What does "var FOO = FOO || {}" mean in Javascript?
I don’t understand that :
var gapi = window.gapi||{};
Can you explain me? gapi is a bool?
Possible Duplicate: What does "var FOO = FOO || {}" mean in Javascript? I
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Possible Duplicate:
What does "var FOO = FOO || {}" mean in Javascript?
I don’t understand that :
var gapi = window.gapi||{};
Can you explain me? gapi is a bool?
It means if the variable
gapiexists already, and its value does not evaluate to a boolean false one, assign that to the variablegapiotherwise assign a new object to it.This practice is helpful to avoid overwriting of variables.
These are the JavaScript values that evaluate to boolean false:
falseundefinednull0NaN"")