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/**
* For type-checking Javascript values.
* @module typical
* @typicalname t
* @example
* const t = require('typical')
*/
/**
* Returns true if input is a number
* @param {*} - the input to test
* @returns {boolean}
* @static
* @example
* > t.isNumber(0)
* true
* > t.isNumber(1)
* true
* > t.isNumber(1.1)
* true
* > t.isNumber(0xff)
* true
* > t.isNumber(0644)
* true
* > t.isNumber(6.2e5)
* true
* > t.isNumber(NaN)
* false
* > t.isNumber(Infinity)
* false
*/
function isNumber (n) {
return !isNaN(parseFloat(n)) && isFinite(n)
}
/**
* A plain object is a simple object literal, it is not an instance of a class. Returns true if the input `typeof` is `object` and directly decends from `Object`.
*
* @param {*} - the input to test
* @returns {boolean}
* @static
* @example
* > t.isPlainObject({ something: 'one' })
* true
* > t.isPlainObject(new Date())
* false
* > t.isPlainObject([ 0, 1 ])
* false
* > t.isPlainObject(/test/)
* false
* > t.isPlainObject(1)
* false
* > t.isPlainObject('one')
* false
* > t.isPlainObject(null)
* false
* > t.isPlainObject((function * () {})())
* false
* > t.isPlainObject(function * () {})
* false
*/
function isPlainObject (input) {
return input !== null && typeof input === 'object' && input.constructor === Object
}
/**
* An array-like value has all the properties of an array, but is not an array instance. Examples in the `arguments` object. Returns true if the input value is an object, not null and has a `length` property with a numeric value.
*
* @param {*} - the input to test
* @returns {boolean}
* @static
* @example
* function sum(x, y){
* console.log(t.isArrayLike(arguments))
* // prints `true`
* }
*/
function isArrayLike (input) {
return isObject(input) && typeof input.length === 'number'
}
/**
* returns true if the typeof input is `'object'`, but not null!
* @param {*} - the input to test
* @returns {boolean}
* @static
*/
function isObject (input) {
return typeof input === 'object' && input !== null
}
/**
* Returns true if the input value is defined
* @param {*} - the input to test
* @returns {boolean}
* @static
*/
function isDefined (input) {
return typeof input !== 'undefined'
}
/**
* Returns true if the input value is a string
* @param {*} - the input to test
* @returns {boolean}
* @static
*/
function isString (input) {
return typeof input === 'string'
}
/**
* Returns true if the input value is a boolean
* @param {*} - the input to test
* @returns {boolean}
* @static
*/
function isBoolean (input) {
return typeof input === 'boolean'
}
/**
* Returns true if the input value is a function
* @param {*} - the input to test
* @returns {boolean}
* @static
*/
function isFunction (input) {
return typeof input === 'function'
}
/**
* Returns true if the input value is an es2015 `class`.
* @param {*} - the input to test
* @returns {boolean}
* @static
*/
function isClass (input) {
if (isFunction(input)) {
return /^class /.test(Function.prototype.toString.call(input))
} else {
return false
}
}
/**
* Returns true if the input is a string, number, symbol, boolean, null or undefined value.
* @param {*} - the input to test
* @returns {boolean}
* @static
*/
function isPrimitive (input) {
if (input === null) return true
switch (typeof input) {
case 'string':
case 'number':
case 'symbol':
case 'undefined':
case 'boolean':
return true
default:
return false
}
}
/**
* Returns true if the input is a Promise.
* @param {*} - the input to test
* @returns {boolean}
* @static
*/
function isPromise (input) {
if (input) {
const isPromise = isDefined(Promise) && input instanceof Promise
const isThenable = input.then && typeof input.then === 'function'
return !!(isPromise || isThenable)
} else {
return false
}
}
/**
* Returns true if the input is an iterable (`Map`, `Set`, `Array`, Generator etc.).
* @param {*} - the input to test
* @returns {boolean}
* @static
* @example
* > t.isIterable('string')
* true
* > t.isIterable(new Map())
* true
* > t.isIterable([])
* true
* > t.isIterable((function * () {})())
* true
* > t.isIterable(Promise.resolve())
* false
* > t.isIterable(Promise)
* false
* > t.isIterable(true)
* false
* > t.isIterable({})
* false
* > t.isIterable(0)
* false
* > t.isIterable(1.1)
* false
* > t.isIterable(NaN)
* false
* > t.isIterable(Infinity)
* false
* > t.isIterable(function () {})
* false
* > t.isIterable(Date)
* false
* > t.isIterable()
* false
* > t.isIterable({ then: function () {} })
* false
*/
function isIterable (input) {
if (input === null || !isDefined(input)) {
return false
} else {
return (
typeof input[Symbol.iterator] === 'function' ||
typeof input[Symbol.asyncIterator] === 'function'
)
}
}
export default {
isNumber,
isString,
isBoolean,
isPlainObject,
isArrayLike,
isObject,
isDefined,
isFunction,
isClass,
isPrimitive,
isPromise,
isIterable
}
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