13 JS Variable is null - JavaScript Tutorial 2018

Publicado em: 17 Junho 2017
no canal de: Ricky Wahowa

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Hey, and welcome back.

What does it mean if a variable has a value of NULL.

Well in JavaScript, NULL is treated just like zero.

So if I was doing some kind of, or some kind of arithmetic, and I was using NULL, it would behave just as zero.

So let's see this and we leave it here in Scratchpad.

So if I come here, let me delete all of this.

So let's say ‘var’, ‘var’ let’s call variable var tax=null; and then ‘alert’, let’s do some kind of arithmetic.

So let’s say null times, times 10,000 and then we run this, you see it’s equal to zero, because it's treated as zero.

So we can also say ‘null+10,000’, if we run this, it's 10,000.

So null is treated as zero.

Let's continue in the next video.

And in the next video, we’ll start looking at variable hoisting.

See you then.

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