npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

iterate-value

v1.0.2

Published

Iterate any iterable JS value. Works robustly in all environments, all versions.

Downloads

11,991,578

Readme

iterate-value Version Badge

Build Status dependency status dev dependency status License Downloads

npm badge

Iterate any iterable JS value. Works robustly in all environments, all versions.

In modern engines, [...value] or Array.from(value) or for (const item of value) { } are sufficient to iterate an iterable value (an object with a Symbol.iterator method). However, older engines:

  • may lack Symbol, array spread, or for..of support altogether
  • may have Symbol.iterator but not implement it on everything it should, like arguments objects
  • may have Map and Set, but a non-standard name for the iterator-producing method (.iterator or ['@@iterator'], eg) and no syntax to support it
  • may be old versions of Firefox that produce values until they throw a StopIteration exception, rather than having iteration result objects
  • may be polyfilled/shimmed/shammed, with es6-shim or core-js or similar

This library attempts to provide an abstraction over all that complexity!

If called with a single value, it will return an array of the yielded values. If also called with a callback function, it will instead call that callback once for each yielded value.

In node v13+, exports is used by the es-get-iterator dependency to provide a lean implementation that lacks all the complexity described above, in combination with the browser field so that bundlers will pick up the proper implementation.

If you are targeting browsers that definitely all have Symbol support, then you can configure your bundler to replace require('has-symbols')() with a literal true, which should allow dead code elimination to reduce the size of the bundled code.

Example

var iterate = require('iterate-value');
var assert = require('assert');

assert.deepEqual(iterate('a 💩'), ['a', ' ', '💩']);
assert.deepEqual(iterate([1, 2]), [1, 2]);
assert.deepEqual(iterate(new Set([1, 2])), [1, 2]);
assert.deepEqual(iterate(new Map([[1, 2], [3, 4]])), [[1, 2], [3, 4]]);

function assertWithCallback(iterable, expected) {
	var values = [];
	var callback = function (x) { values.push(x); };
	iterate(iterable, callback);
	assert.deepEqual(values, expected);
}
assertWithCallback('a 💩', ['a', ' ', '💩']);
assertWithCallback([1, 2], [1, 2]);
assertWithCallback(new Set([1, 2]), [1, 2]);
assertWithCallback(new Map([[1, 2], [3, 4]]), [[1, 2], [3, 4]]);

Tests

Simply clone the repo, npm install, and run npm test