Object with 2 methods. Method A, Method B. Calling Method B from within Method A-CodePudding

Say I have two methods on an Object.

Object = {
    MethodA() {
        console.log('A')
    },

    MethodB() {
        this.MethodA()
    }
}

The MethodA doesn't get called. why is this and how can I learn more about what I am doing wrong. What is the terminology called and where is this explained in the ECMA standard?

CodePudding user response：

Because this will be determined by the context in which the method is called and will not always refer to the object.

const object  = {
    MethodA() {
        console.log('this in A: ', this === window ? 'window' : this)
    },

    MethodB() {
        console.log('this in B: ', this === window ? 'window' : this)
        object.MethodA()
    }
}

object.MethodB() // this in B === object

const b = object.MethodB;

b() // this in B === window