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);
    }
}