bind

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bind

~ create a function by bind

let user = {
  firstName: "John"
};

function func() {
  console.log(this.firstName);
}

let funcUser = func.bind(user);
funcUser(); // John

call/apply/bind

codementor

call vs apply

let info = 'kamal'
let user = (pro,age) => {
  return `${this.info}\'s ${pro} is ${age} `
}
console.log(user.call(info,'age',21))
// kamal's age is 21

apply

same as call
but 2nd argument must be an array

let info = 'kamal'
let datas = ['age',21]
let user = (pro,age) => {
  return `${this.info}\'s ${pro} is ${age} `
}
console.log(user.apply(info,datas))
// kamal's age is 21