CODEWITHSUNDEEP
javascript
Futur
Futur

Reputation: 8482

Javascript new keyword - code explanation request

Can you please explain the following piece of code, ? it is working in my browser console. So how does this work ? The new keyword doesnt create a new instance at all or how is it ?

 var myObject = new Object(); // Produces an Object() object.
    myObject['0'] = 'f';
    myObject['1'] = 'o';
    myObject['2'] = 'o';
    console.log(myObject); // Logs Object { 0="f", 1="o", 2="o"}

    var myString = new String('foo'); // Produces a String() object.
    console.log(myString); // Logs foo { 0="f", 1="o", 2="o"

Please explain.

Upvotes: 0

Views: 96

Answers (2)

mdziekon
mdziekon

Reputation: 3627

It's completely normal behavior:

new String creates an Object, if you will type "var myString = new String('moo')", you will get another object with different values.

https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/String/#se‌​ction_7

Upvotes: 0

Quentin
Quentin

Reputation: 943694

if its a new instance how does it carry the value of myObject onto myString variable

It doesn't. You are initialising your String object with a string literal:

new String('foo');

That foo is an entirely different foo to the characters you assign to the three properties of the object. For comparison, replace the second foo with bar.

Upvotes: 1

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