Best of Modern JavaScript — New Data Structures

Best of Modern JavaScript — New Data Structures

In this article, we’ll look at controlling the spreadability of arrays, maps, and sets.

Since 2015, JavaScript has improved immensely.

It’s much more pleasant to use it now than ever.

In this article, we’ll look at controlling the spreadability of arrays, maps, and sets.

Symbol.isConcatSpreadable

The Symbol.isConcatSpreadable isn’t part of any object in the ES6 standard library.

The mechanism exists purely for browser APIs and user code.

This means the subclasses of Array are spread by default.

Subclasses of Array can prevent instances from being spread by setting Symbol.isConcatSpreadable to fale .

This property can be an instance or a prototype property.

Other array-like objects are spread by concat if Symbol.isConcatSpreadable is true .

This means we can turn on spreading for some array-like objects.

Typed arrays aren’t spread and they don’t have the concat instance method.

Range of Array Indexes

ES6 follows the same rules as ES5 for the array index range.

Lengths are between 0 and 2 ** 32 — 1 .

And indexes are in the range between 0 and 2 ** 32 — 1 .

Strings and typed arrays have a larger range of indexes.

The upper bound of the range is because 2 ** 53 — 1 is the largest integer that JavaScript gloating point numbers can represent safely.

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