JS: Function Call, Apply, Bind
function , when called, has a associated value called “this binding”.
In function body, the value of “this binding” is represented by the keyword
[see JS: “this” Binding]
When a function f is a property of a object x, and is called in the form
x.f(…), the value of “this binding” is the object x.
The following are ways to let you call a function and explicitly pass a value of your choice for
Reflect.apply ( f, this_binding, arg_list ) → Call
f with its
this keyword having value of this_binding, and with arguments of elements in arg_list.
[see JS: Reflect.apply]
f.apply(obj, arg_list) → evaluate function
f with f's
this keyword have value of obj, and with arguments of elements in arg_list.
[see JS: Function.prototype.apply]
f.call(obj, arg1, arg2 …) → evaluate
f(arg1, arg2 …) with f's
this keyword having value of obj.
[see JS: Function.prototype.call]
f.bind(obj) → return a function such that it has the same behavior as f except f's
this value is always obj.
f.bind(obj, args …) → the new function will always be given the arguments args.
[see JS: Function.prototype.bind]
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