Security News
OpenJS: “XZ Utils Cyberattack Likely Not an Isolated Incident”
OpenJS is warning of social engineering takeovers targeting open source projects after receiving a credible attempt on the foundation.
is-string
Advanced tools
Weekly downloads
Package description
The is-string npm package is designed to provide a simple and straightforward way to check if a given value is a string. It is useful in various programming scenarios where type validation is required, especially in dynamically typed languages like JavaScript where the type of a variable can change at runtime.
String Type Checking
This feature allows you to check if a given value is a string. It returns true for string literals, string objects created with the new keyword, and false for non-string values.
"use strict";\nconst isString = require('is-string');\n\nconsole.log(isString('hello')); // true\nconsole.log(isString(123)); // false\nconsole.log(isString(new String('hello'))); // true
Similar to is-string, lodash.isstring is a method offered by lodash, a popular utility library. It provides a more comprehensive suite of utilities for various types, but for string checking, it offers similar functionality. Compared to is-string, lodash.isstring comes as part of a larger library, which might not be ideal for projects looking to minimize dependencies.
Validator is a library for string validation and sanitization. While it includes functions to check if a value is a string, its primary focus is on validating and sanitizing strings to ensure they meet certain conditions (e.g., email format, length). It's more feature-rich compared to is-string but also more complex if you only need type checking.
Readme
Is this value a JS String object or primitive? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
var isString = require('is-string');
var assert = require('assert');
assert.notOk(isString(undefined));
assert.notOk(isString(null));
assert.notOk(isString(false));
assert.notOk(isString(true));
assert.notOk(isString(function () {}));
assert.notOk(isString([]));
assert.notOk(isString({}));
assert.notOk(isString(/a/g));
assert.notOk(isString(new RegExp('a', 'g')));
assert.notOk(isString(new Date()));
assert.notOk(isString(42));
assert.notOk(isString(NaN));
assert.notOk(isString(Infinity));
assert.notOk(isString(new Number(42)));
assert.ok(isString('foo'));
assert.ok(isString(Object('foo')));
Simply clone the repo, npm install
, and run npm test
FAQs
Is this value a JS String object or primitive? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
The npm package is-string receives a total of 24,825,502 weekly downloads. As such, is-string popularity was classified as popular.
We found that is-string demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
Did you know?
Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.
Security News
OpenJS is warning of social engineering takeovers targeting open source projects after receiving a credible attempt on the foundation.
Company News
Come meet the Socket team at BSidesSF and RSA! We're sponsoring several fun networking events and we would love to see you there.
Security News
OSI is starting a conversation aimed at removing the excuse of the SaaS loophole for companies navigating licensing and the complexities of doing business with open source.