tessl/npm-is-js

Micro check library providing comprehensive type checking and validation operations across different JavaScript environments

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Overview

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Presence Checking

Name: tessl/npm-is-js
Author: tessl

Functions for checking value existence, truthiness, and basic state validation.

Capabilities

Empty Check

Checks if the given value is empty (works with objects, arrays, and strings).

/**
 * Checks if the given value is empty
 * @param value - Value to check (array, object, or string)
 * @returns True if value is empty
 * Interfaces: not, all, any
 */
function empty(value: any): boolean;

Usage Example:

is.empty({});              // true
is.empty([]);              // true
is.empty('');              // true
is.not.empty(['foo']);     // true
is.all.empty('', {}, ['foo']); // false
is.any.empty([], 42);      // true

Existy Check

Checks if the given value is existy (not null or undefined).

/**
 * Checks if the given value is existy (not null or undefined)
 * @param value - Value to check
 * @returns True if value is not null or undefined
 * Interfaces: not, all, any
 */
function existy(value: any): boolean;

Usage Example:

is.existy({});             // true
is.existy(null);           // false
is.not.existy(undefined);  // true
is.all.existy(null, ['foo']); // false
is.any.existy(undefined, 42); // true

Falsy Check

Checks if the given value is falsy.

/**
 * Checks if the given value is falsy
 * @param value - Value to check
 * @returns True if value is falsy
 * Interfaces: not, all, any
 */
function falsy(value: any): boolean;

Usage Example:

is.falsy(false);           // true
is.falsy(null);            // true
is.not.falsy(true);        // true
is.all.falsy(null, false); // true
is.any.falsy(undefined, true); // true

Truthy Check

Checks if the given value is truthy (existy and not false).

/**
 * Checks if the given value is truthy
 * @param value - Value to check
 * @returns True if value is truthy
 * Interfaces: not, all, any
 */
function truthy(value: any): boolean;

Usage Example:

is.truthy(true);           // true
is.truthy(null);           // false
is.not.truthy(false);      // true
is.all.truthy(null, true); // false
is.any.truthy(undefined, true); // true

Space Check

Checks if the given value is a whitespace character.

/**
 * Checks if the given value is space
 * @param value - Value to check
 * @returns True if value is whitespace character
 * Interfaces: not, all, any
 */
function space(value: any): boolean;

Usage Example:

is.space(' ');             // true
is.space('foo');           // false
is.not.space(true);        // true
is.all.space(' ', 'foo');  // false
is.any.space(' ', true);   // true