Refer to javascript function from within itself

Question

Consider this piece of code

var crazy = function() {
    console.log(this);
    console.log(this.isCrazy); // wrong.
}
crazy.isCrazy = \'totally\';
crazy();
         


        

Answer 1

In order to make you code to work follow below

        function crazy_object (crazy) {
          this.isCrazy = crazy
        }
        
        var create_crazy = new crazy_object('hello') //creating object
        
        console.log(create_crazy); //=> { isCrazy = 'hello' }
        
        var crazy = function() {
            console.log(this); //=> { isCrazy = 'totally' }
            console.log(this.isCrazy); //=> 'totally'
        }
        
        create_crazy.isCrazy = 'totally'; //=> isCrazy = 'totally'
        //below we pass the created object in function crazy.
        //And doing that we can use the keywork `this` and refer to the object
        crazy.call(create_crazy, null);

Using the call and apply method we can pass to a function a property,and in that function we can use the property with the keyword this

For example:

function speak (message) {
  console.log(`A person with name ${this.name} say ${message}`);
}

speak.call({ name: 'Roland' }, 'Javascript is awesome');

To use it with property:

function speak (message) {
  console.log(`A person with name ${this.name} say ${message}`);
}

var name = 'Roland'

speak.call({ name }, 'Javascript is awesome');