July 2018
Intermediate to advanced
420 pages
8h 46m
English
Content preview from Hands-On Full Stack Web Development with Angular 6 and Laravel 5
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Types: undefined and null
In TypeScript, undefined and null are types themselves; this means that undefined is a type (undefined) and null is a type (null). Confusing? undefined and null cannot be type variables; they can only be assigned as values to variables.
They are also different: a null variable means that a variable was set to null, while an undefined variable has no value assigned.
let A = null; console.log(A) // null console.log(B) // undefined
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.