call() Method
The call() method accepts an object and optionally argument list.
See the syntax below:
object.method.call(obj1[, arg1, ...argN])
call() method with a parameter object
The call() method is used on an object. The parameter passed to the function is also an object.
See the examples below:
Without call() method.
const person = {
firstName: "Osagie",
lastName: "Bello",
fullName() {
return `Hello ${this.lastName} ${this.firstName}!`;
}
};
console.log(person.fullName()); // Hello Bello Osagie!
With call() method.
const person = {
fullName() {
return `Hello ${this.lastName} ${this.firstName}!`;
};
const person1 = {
firstName: "Osagie",
lastName: "Bello"
};
const person2 = {
firstName: "Richard",
lastName: "Jury"
};
console.log(person.fullName.call(person1)); Hello Bello Osagie!
console.log(person.fullName.call(person2)); // Hello Richard Jury!
call() method with arguments
The call() method is used on an object with arguments also passed to the function.
const person = {
fullName(country, city) {
return `${this.firstName} ${this.lastName}, ${country} ${city}`;
}
};
const person1 = {
firstName: "Osagie",
lastName: "Bello"
};
const person2 = {
firstName: "Richard",
lastName: "Jury"
};
console.log(person.fullName.call(person1, "Nigeria", "Lagos"));
// Osagie Bello, Nigeria Lagos
console.log(person.fullName.call(person2, "UK", "Oxford"));
// Richard Jury, UK Oxford
apply() Method
The apply() method accepts an object and optionally array instead of an argument list.
See the syntax below:
object.method.apply(obj1[, array])
apply() method with arguments array
Not only an object be passed to the apply method, but it also accepts an array.
const person = {
fullName(country, city) {
return `${this.firstName} ${this.lastName}, ${country} ${city}`;
}
};
const person1 = {
firstName: "Osagie",
lastName: "Bello"
};
const person2 = {
firstName: "Richard",
lastName: "Jury"
};
console.log(person.fullName.call(person1, "Nigeria", "Lagos"));
// Osagie Bello, Nigeria Lagos
console.log(person.fullName.apply(person2, ["UK", "Oxford"]));
// Richard Jury, UK Oxford
Happy coding!!!
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