Guys I would like a theoretical answer for this question.
I would like to know if calling f.call(null,x) is any possibly slower than calling f(x) ?
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Guys I would like a theoretical answer for this question.
I would like to know if calling f.call(null,x) is any possibly slower than calling f(x) ?
Yes, it will be very marginally slower because of the addition property lookup (finding member
callon functionf). It is very much a micro-optimization and not something that should put you off usingcall()when it’s necessary.On the other hand, I’ve noticed that functions created with
bind()are slower than their unbound counterparts and also slower than usingcall(), in most browsers. Just in case you were thinking that may be a way around any performance deficit.Note that someone has already set up some tests for this over at http://jsperf.com.