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The JavaScript Interview Handbook: 100+ Interview Questions

Solution Review: Bind Function

Understand how to implement a custom bind function in JavaScript using rest parameters and the apply method. Learn how bind sets the this context and allows partial application of arguments. This lesson helps you grasp foundational concepts to handle function context and invocation in JavaScript interviews.

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Solution

Node.js
const bind = (fn, obj) => (...args) => fn.apply(obj, args)
function multiply(a) {
  console.log(this.val * a.val2);
}
var obj = {val : 2}
function callingBind(){
  const bindFunc = bind(multiply, obj)
  bindFunc.call(this,{val2 : 2}) 
}
callingBind()

Explanation

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