February 2018
Intermediate to advanced
298 pages
8h 22m
English
Content preview from Learn ECMAScript - Second Edition
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Expressions
Template strings also bring something called "expressions" to JavaScript. Earlier, there was no other choice than merely concatenating strings together. For example, to embed expressions within normal strings, you would do something like this:
var a = 20;var b = 10;var c = "JavaScript";var str = "My age is " + (a + b) + " and I love " + c;console.log(str);
The output is as follows:
My age is 30 and I love JavaScript
However, now template strings make it much easier to embed expressions in strings. Template strings can contain expressions in them. The expressions are placed in placeholders indicated by a dollar sign and curly brackets, that is, ${expressions}. The resolved value of expressions in the placeholders and the text between ...
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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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