fleck-js

fleck-js

fleck-js is a collection of javascript functions and utilities to help developers code faster, bigger and better apps. It does not have dependencies, it is written entirely in vanilla javascript, so it will not install unnecessary packages and libraries increasing your project's bundle size.

Installation

npm install fleck-js

Import or Require

const fleck = require('fleck-js');
console.log(fleck.isArray([1,2,3])); // true

or

import {isArray} from 'fleck-js';
console.log(isArray([1,2,3])); // true

Categories

fleck-js focuses on everyday pieces of code developers write over and over again, which we have separated in three different categories:

• Validations
• Formatting
• Utilities

Validations

isArray

It determines if the given value is an array or not.

Syntax

isArray(array, strictMode)

Parameters

Parameter	Description
array	Required. The value to be tested.
strictMode	Optional. Defaults to true. Validation strategy, it determines if an empty array is valid or not.

Examples

isArray([1,2,3])       // true
isArray([])            // false
isArray([1,2,3],false) // true
isArray([],false)      // true
isArray('')            // false
isArray(123)           // false

isBoolean

It determines if the given value is a boolean or not.

Syntax

isBoolean(boolean, strictMode)

Parameters

Parameter	Description
boolean	Required. The value to be tested.
strictMode	Optional. Defaults to true. Validation strategy, it determines if strings containing 'true' or 'false', uppercase or lowercase are valid or not.

Examples

isBoolean(true)         // true
isBoolean(false)        // true
isBoolean('true')       // false
isBoolean('true',false) // true
isBoolean('TRUE',false) // true
isBoolean(123)          // false

isNumber

It determines if the given value is a number or not.

Syntax

isNumber(number, strictMode)

Parameters

Parameter	Description
number	Required. The value to be tested.
strictMode	Optional. Defaults to true. Validation strategy, it determines if strings containing numbers are valid or not.

Examples

isNumber(123.45)         // true
isNumber('123.45')       // false
isNumber(true)           // false
isNumber([])             // false
isNumber(new Date())     // false
isNumber('123.45',false) // true

isFunction

It determines if the given value is a function or not.

Syntax

isFunction(func)

Parameters

Parameter	Description
func	Required. The value to be tested.

Examples

isFunction(function(){})   // true
isFunction(() => {})       // true
isFunction(true)           // false
isFunction([])             // false
isFunction('() => {}')     // false
isFunction('function(){}') // false

isObject

It determines if the given value is a object or not.

Syntax

isObject(object, strictMode)

Parameters

Parameter	Description
isObject	Required. The value to be tested.
strictMode	Optional. Defaults to true. Validation strategy, it determines if an empty object is valid or not.

Examples

isObject({foo:123.45})    // true
isObject({})              // false
isObject({foo:123},false) // true
isObject({},false)        // true
isObject("")              // false
isObject(123.45)          // false

isDate

It determines if the given value is an instance of Date or not.

Syntax

isDate(date)

Parameters

Parameter	Description
date	Required. The value to be tested.

Examples

isDate(new Date())   // true
isDate("01/01/2000") // false
isDate(123.45)       // false
isDate("")           // false
isDate([])           // false
isDate(() => {})     // false

isString

It determines if the given value is a string or not.

Syntax

isString(string, strictMode)

Parameters

Parameter	Description
string	Required. The value to be tested.
strictMode	Optional. Defaults to true. Validation strategy, it determines if an empty string is valid or not.

Examples

isString("foo")       // true
isString("")          // false
isString("foo",false) // true
isString("",false)    // true
isString("123.45")    // true
isString(123.45)      // false