February 2018
Intermediate to advanced
298 pages
8h 22m
English
Content preview from Learn ECMAScript - Second Edition
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Transferring (not copying) data through postMessage
It is possible to actually just transfer large amounts of data using the postMessage function. What does that mean, and how it is different from what we've been doing so far with postMessage?
Well, the actual syntax of postMessage is: postMessage(aMessage, transferList).
What this means is, whatever you pass as transferList is apparently lost in the worker that sent it. You actually gave the other script the authority to own that data. You transferred the ownership of that data to that other script. Remember, this is different from what used to usually happen (that is, you can still access the object in the same script that sent it to the web worker/main script) because in this case, the data ...
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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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.