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as follow codes:
var a = {};
if(!!!a[tabType]){
a[tabType] = [];
a[tabType].push([self,boxObj]);
}else{
a[tabType].push([self,boxObj]);
}
i think !!!a[tabType] equals !a[tabType]
why use the “!!!” not “!” ?
thank you!
The
!!construct forces conversion to a boolean. I don’t see the point of it here.