How does toString work in js?

• 0

  var user = {
  
    firstName: 'Василий',
  
    toString: function() {
      return 'Пользователь ' + this.firstName;
    }
  };
  
  console.log(user);

  
  Why does it display not what is in the toString function, but the object itself? How does it work in js?

  JavaScript Dominick Bradford, Aug 8, 2019

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2 Answers
• 0
  Because toString is a method, the method is called when you access it. To get the result of executing an object method, you need to refer to it.
  
  console.log (user.toString ());

  Carter Duncan

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• 0

  function validator(value) {
  
      return {
  
        equal(array) {
  
      	if(array.toString() === value.toString()) {
  
        	  return true;
  
          } else {
  
        	  return false;
  
          }
  
        },
  
        isArray() {
  
      	if(Array.isArray(value)) {
  
        	  return this;
  
          } else {
  
        	  return false;
  
          }
  
        },
  
        isString() {
  
      	if(typeof value === "string") {
  
        	  return true;
  
          } else {
  
        	  return false;
  
          }
  
        },
  
        isNumber() {
  
      	if(typeof value === "number") {
  
        	  return true;
  
          } else {
  
        	  return false;
  
        }
  
      }
  
    }
  
  }
  
  
  
  console.log(validator('1').isArray()); // false
  
  console.log(validator([]).isArray().equal([1, 2, 3])); // false
  
  console.log(validator([1, 2, 3]).isArray().equal([1, 2, 3])); // true
  
  console.log(validator('1').isString()); // true
  
  console.log(validator('1').isNumber()); // false

  Anonymous

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