is-string
Advanced tools
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'))); // trueSimilar 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.
Changelog
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
Unknown package
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.
Research
Security News
Socket researchers unpack a typosquatting package with malicious code that logs keystrokes and exfiltrates sensitive data to a remote server.
Security News
The JavaScript community has launched the e18e initiative to improve ecosystem performance by cleaning up dependency trees, speeding up critical parts of the ecosystem, and documenting lighter alternatives to established tools.
Product
Socket now supports four distinct alert actions instead of the previous two, and alert triaging allows users to override the actions taken for all individual alerts.