全局Object中javascript参数中的奇怪行为

Question

there is a strange behavior in an argument inside a Global Javascript object: I need to test my code with jasmine.js, but I can´t pass the expected value to the argument always return undefined in jasmine test.

//My model
myGlobalObject = function(){
  _myCart = function(){
      return {
        total : 0,
        products : []
       }
   }

   return {
      init: function(strangeArgument){
        console.log(strangeArgument) //this return undefined in jasmine test
       },

     myCart : _myCart,

     addProduct : function(Products){
       return _myCart()
     },

    .....
   }

}

The test:

const c{
   empty : {
      total: {
        beforeVAT: 0,
        afterVAT: 0,
        VAT: 0
      },
     products: []
  }
}

beforeEach(() => {
    this.instance = myGlobalObject();
    this.instance.init();
    this.productWithoutQuantity = Object.assign({}, _.productA);
    delete this.productWithoutQuantity.quantity;
    this.productWithQuantity = Object.assign({}, _.productB);
  });

test(`the cart should be empty`, () => {
    expect(this.instance.getCart()).toEqual(c.empty);
  });

.... more tests

And my main js:

var e = myGlobalObject();
var initialState = function (){
   return {
      total: {
        beforeVAT: 0,
        afterVAT: 0,
        VAT: 0
      },
     products: []
  }
}
e.init(initialState);

What its wrong?

Answer 1

Although I fail to completely understand the intent of the OP here, following is my take on the question

• _myCart can be a local variable because it doesn't seem to serve any greater purpose, atleast from the code provided by OP

• The call to instance.init can be with empty parenthesis or with a legitimate variable- depends on what OP is trying to achieve here.

• I've included both main.js code snippet as well as testVariable.instance.init(); (on a simple note its undefined if it is undefined anyway as commented by @Bergi)

• See it in action here

 myGlobalObject = function() { this._myCart = function() { return { total: 0, products: [] } } return { init: function(strangeArgument) { console.log(strangeArgument) }, myCart: this._myCart, addProduct: function(Products) { return this._myCart() } } } var e = myGlobalObject(); var initialState = function() { return { total: { beforeVAT: 0, afterVAT: 0, VAT: 0 }, products: [] } } e.init(initialState); describe('ajax test suite', function() { var testVariable = {} var c = { empty: { total: 0, products: [] } } beforeEach(function() { testVariable.instance = myGlobalObject(); testVariable.instance.init("hello"); testVariable.instance.init(); }); it('the cart should be empty', function() { expect(testVariable.instance.myCart()).toEqual(c.empty); }); });