By Kyle Simpson
No subject how a lot event you've gotten with JavaScript, odds are you don’t totally comprehend the language. As a part of the "You Don’t be aware of JS" sequence, this compact advisor specializes in new good points on hand in ECMAScript 6 (ES6), the most recent model of the normal upon which JavaScript is built.
Like different books during this sequence, You Don’t recognize JS: ES6 & Beyond dives into trickier elements of the language that many JavaScript programmers both keep away from or recognize not anything approximately. Armed with this data, you could in achieving precise JavaScript mastery.
With this e-book, you will:
- Learn new ES6 syntax that eases the soreness issues of universal programming idioms
- Organize code with iterators, turbines, modules, and classes
- Express async movement keep an eye on with supplies mixed with generators
- Use collections to paintings extra successfully with info in based ways
- Leverage new API helpers, together with Array, item, Math, quantity, and String
- Extend your program’s features via meta programming
- Preview positive aspects most likely coming to JS past ES6
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Extra resources for ES6 & Beyond
Sample text
Destructuring also mixes fine with other ES6 function parameter capabilities, like default parameter values and rest/gather parameters. Consider these quick illustrations (certainly not exhaustive of the possible variations): function f1([ x=2, y=3, z ]) { .. z], w) { .. w) { .. } function f4({ x: X, y }) { .. } function f5({ x: X = 10, y = 20 }) { .. } function f6({ x = 10 } = {}, { y } = { y: 10 }) { .. log( x, y, z, w ); } f3( [] ); f3( [1,2,3,4], 5, 6 ); // undefined undefined [] [] // 1 2 [3,4] [5,6] There are two ...
Log( b, x, z ); // 2 4 6 The 1 and 3 values that came back from foo() are discarded, as is the 5 value from bar(). log( d, w ); // 3 6 // undefined undefined This behavior follows symmetrically from the earlier stated “unde fined is missing” principle. We examined the ... operator earlier in this chapter, and saw that it can sometimes be used to spread an array value out into its separate values, and sometimes it can be used to do the opposite: to gather a set of values together into an array. In addition to the gather/rest usage in function declarations, ...
Log( b ); // [1,2,3,4,5] In this usage, ... concat( a, [5] ) here. The other common usage of ... can be seen as essentially the oppo‐ site; instead of spreading a value out, the ... gathers a set of values together into an array. ” Because x was assigned 1, and y was assigned 2, the rest of the arguments 3, 4, and 5 were gathered into z. Of course, if you don’t have any named parameters, the ... ) function declara‐ tion is usually called “rest parameters,” because you’re collecting the rest of the parameters.
ES6 & Beyond by Kyle Simpson
by Daniel
4.3