Some utility functions.

Install

browser - global variable

<script src="util-ma.js"></script>

The global variable u is used, you can change it from here.

browser - requirejs

define(['util-ma'], function (util) {
    util.isObj([]) // false
});

node

const util = require('util-ma');

Doc

Function	Description
isObj(v)	Is value an object?
isNull(v)	Is value null?
isInt(n)	Is number an integer?
isOdd(n)	Is number odd?
isEmptyObj(v)	Is value an empty object?
moveArrItem(arr, from, to)	Move array item from to.
negateNum(n)	Make a positive number negative.
positNum(n)	Make a negative number positive.
reverseNumSign(n)	Reverse a number's sign.
randInt(min, max)	Generate a random integer, between min and max arguments. (default between 0 and 10)
randFloat(min, max)	Generate a random floating-point, between min and max arguments. (default between 0 and 10)
toDecimalPlace(n)	Filter a floating-point decimal places to a specific amount.
substrBeforeLast(char, str)	Get the substring before the last occurrence of char in str.
substrAfterLast(char, str)	Get the substring after the last occurrence of char in str.
substrBeforeFirst(char, str)	Get the substring before the first occurrence of char in str.
substrAfterFirst(char, str)	Get the substring after the last occurrence of char in str.
extend( obj1, obj2 [, obj3, ...] )	Make the right-most object argument inherit from the previous left object arguments. (obj2 inherits from obj1, obj3 inherits from obj2.)

util.extend() example:

function newPerson(name, age) {
    var inst = {}; // the instance (this)

    inst.name = name || "no_name";
    inst.age  = age  || false;

    return inst;
}

function newEmployee(name, age, jobTitle, id) {
    var inst = {}, // the instance (this)
        person = newPerson(name, age),
        idCounter = 0;

    inst = util.extend( person, inst );

    inst.jobTitle  = jobTitle || "uknown_title";
    inst.employeId = id       || "employe_"+(idCounter+=1);

    return inst;
}

var employee = newEmployee("ali", 26, "product_manager");

employee.name      // "ali"
employee.age       // 26
employee.jobTitle  // "product_manager"
employee .id       // "employe_1"

// You can think of it this way:
class Employee extends Person {
    constructor(name, age, jobTitle, id) {
        super(name, age);
    }
}