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is-string

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is-string

Is this value a JS String object or primitive? This module works cross-realm/iframe, and despite ES6 @@toStringTag.


Version published
Weekly downloads
25M
decreased by-18.77%
Maintainers
1
Install size
50.1 kB
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Weekly downloads
 

Package description

What is is-string?

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.

What are is-string's main functionalities?

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

Other packages similar to is-string

Changelog

Source

v1.0.7 - 2021-08-05

Commits

  • [Refactor] use has-tostringtag to behave correctly in the presence of symbol shams d973ffd
  • [Dev Deps] update auto-changelog, core-js, eslint, tape 4bfaabf

Readme

Source

is-string Version Badge

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Is this value a JS String object or primitive? This module works cross-realm/iframe, and despite ES6 @@toStringTag.

Example

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')));

Tests

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

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FAQs

Package last updated on 06 Aug 2021

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