JavaScript: Function Call, Apply, Bind

In JavaScript, any function defined by function , when called, has a associated value called “this binding”. In function body, the value of “this binding” is represented by the keyword this.

[see 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 this binding.

• Reflect.apply
• Function.prototype.apply
• Function.prototype.call
• Function.prototype.bind