JavaScript quiz. Consider following snippet: <pre> <code class="jav

Consider following snippet:

 var a = Array(); 
a[a.length] = 0; 
alert(a.length);

What will be displayed in alert box?

undefined
1
0
Nothing will be displayed

Explanation

First we have create an empty Array.

a.length = 0;

Second we have add element and set it's value to 0.
a[a.length] = 0; the same as a[0] = 0;
That is means we will have one element in array and array length become 1.

arrays

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@basimdev32 we are happy that you learned something new ;)

2018 Feb 4, 6:00:07 PM

Hm... I didn't know that Array() create a new array. I thought operator new is required and without new the context inside Array function will be the window.

2018 Jan 26, 6:50:46 PM

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