Is there a library for a Set data type in Javascript?

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Since Javascript doesn't have a built in set datatype has anyone come across a decent library for sets and set operations like union, intersection, etc?

Have a look at JS.Set.

The JS.Set class can be used to model collections of unique objects. A set makes sure that there are no duplicates among its members, and it allows you to use custom equality methods for comparison as well as JavaScript’s === operator.

It contains methods like union, intersection, merge, etc ...

JavaScript data types and data structures, Special non-data but structural type for any constructed object instance also used as data structures: new Object, new Array, new Map, new Set, new WeakMap, new JavaScript has a standard library of built-in objects. The Set object lets you store unique values of any type, whether primitive values or object references. Description. Set objects are collections of values. You can iterate through the elements of a set in insertion order. A value in the Set may only occur once; it is unique in the Set's collection. Value equality

If you just want to have access to simple union, intersection functions, you could also try Underscore.js's built-in Array functions. It also provides a lot of more useful utilities for data manipulation, so try it if you haven't.

3. Data Types and Values, Data Types and Values Computer programs work by manipulating values , such characteristics of a programming language is the set of data types it supports. A value in JavaScript is always of a certain type. For example, a string or a number. There are eight basic data types in JavaScript. Here, we’ll cover them in general and in the next chapters we’ll talk about each of them in detail. We can put any type in a variable. For example, a variable can at one moment be a string and then store a

Sets are now native in ES2015.

let a = new Set([1,2,3]);
let b = new Set([1,2,4]);
let intersect = new Set([...a].filter(i => b.has(i)));
let union = new Set([...a, ...b]);

This works with transpiling using babel or just natively in firefox.

Use typeof to Check JavaScript Data Types at Runtime — Tramaine , As such, it can be helpful to check the type of a variable at runtime. In other words, the data type of JavaScript variables can change over the course of a library, but it can also work nicely along side the jQuery library. String type. JavaScript's String type is used to represent textual data. It is a set of "elements" of 16-bit unsigned integer values. Each element in the String occupies a position in the String. The first element is at index 0, the next at index 1, and so on. The length of a String is the number of elements in it.

Check out setjs. The API provides basic operations and the library is immutable by design.

Disclaimer: I'm the author.

JavaScript data types: ES5, ES6, ES2016 (ES7) and TypeScript , The first series of data types available in JavaScript ES5 are called primitives. You can confirm this catch-all behavior of the object data type in the last set of to avoid assignment clashes (e.g. loading multiple libraries that use the same� JavaScript InfoVis Toolkit, more commonly referred to as InfoVis, is one of the leading JavaScript libraries for creating interactive data visualizations. It's a DOM-based manipulation library

immutable-js expose a powerfull set data-structure.

A simple example for node.js, which you can see in work here.

im = require("immutable")

const mySet = im.Set([1, "a", {value: Symbol()}])

// the .add and .delete methods do not modify mySet, but return a new set instance instead.
const newSet = mySet
                .add(42)
                .delete(1)

console.info("Does mySet have 42?", mySet.has(42))
console.info("Does newSet have 42?", newSet.has(42))

Set (abstract data type), In computer science, a set is an abstract data type that can store unique values, without any The Swift standard library contains a Set type, since Swift 1.2. JavaScript introduced Set as a standard built-in object with the ECMAScript 2015 � There are two types of data types in JavaScript. Primitive data type; Non-primitive (reference) data type; JavaScript is a dynamic type language, means you don't need to specify type of the variable because it is dynamically used by JavaScript engine. You need to use var here to specify the data type. It can hold any type of values such as

A Beginner's Guide to JavaScript Variables and Datatypes, A set of dominoes with symbols representing JavaScript variables and datatypes You can always find out the type of a variable using typeof . The operand can be either a literal or a data structure such as a variable, a function, or an object. The operator returns the data type. Syntax. typeof operand or typeof (operand) There are six possible values that typeof returns: object, boolean, function, number, string, and undefined.

Basic Types � TypeScript, The most basic datatype is the simple true/false value, which JavaScript and Accessing an element outside the set of known indices fails with an error: These values may come from dynamic content, e.g. from the user or a 3rd party library. In other words, the data type of JavaScript variables can change over the course of a program's execution. As a result, it can often be helpful to check the data type of a variable at runtime (as the code is executing) prior to performing an operation on said variable. Primitive Data Types. JavaScript provides six built-in primitive types.

JavaScript best practices, Call things by their name — easy, short and readable variable and function names The Yahoo User Interface library's success is partly attributable to this, and there is The easiest way however is to use JavaScript to set a class on a parent to test the type of parameters sent to your functions (using the typeof keyword).