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is

the definitive JavaScript type testing library


Version published
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1.9M
decreased by-3.31%
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2
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What is is?

The 'is' npm package provides a set of utility functions for type checking and validation. It allows developers to easily determine the type of a variable, check for specific conditions, and validate data types.

What are is's main functionalities?

Type Checking

The 'is' package provides functions to check the type of a variable. For example, 'is.string' checks if a value is a string, 'is.number' checks if a value is a number, and 'is.array' checks if a value is an array.

const is = require('is');

console.log(is.string('hello')); // true
console.log(is.number(123)); // true
console.log(is.array([1, 2, 3])); // true

Existence Checks

The 'is' package includes functions to check for the existence and truthiness of values. 'is.empty' checks if a value is empty, 'is.existy' checks if a value exists (is not null or undefined), and 'is.truthy' checks if a value is truthy.

const is = require('is');

console.log(is.empty([])); // true
console.log(is.existy(null)); // false
console.log(is.truthy(1)); // true

Regex and String Checks

The 'is' package provides functions to validate strings against common patterns. For example, 'is.email' checks if a string is a valid email address, 'is.url' checks if a string is a valid URL, and 'is.creditCard' checks if a string is a valid credit card number.

const is = require('is');

console.log(is.email('test@example.com')); // true
console.log(is.url('https://www.example.com')); // true
console.log(is.creditCard('4111111111111111')); // true

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Package last updated on 14 Dec 2018

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