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[JS] bind

caution

This is not original content, but just a note from articles I read.

Intro​

The bind() method creates a new function that, when called, has its this keyword set to the provided value, with a given sequence of arguments preceding any provided when the new function is called.

const module = {
    x: 42,
    getX: function() {
        return this.x;
    }
};

const unboundGetX = module.getX;
console.log(unboundGetX()); // The function gets invoked at the global scope
// Expected output: undefined

const boundGetX = unboundGetX.bind(module);
console.log(boundGetX());
// Expected output: 42

Reference​