About

Math master is a javascript add-on library which has some of the additional methods for arrays,objectsnumbers,strings,validations and so on.

usage

es2015

const math=require('math-master')

es2016

import math from './math-master'

Array methods

Average

An array method that returns the average of the numbers in the array.

const arr=[1,2,3]
arr.average() //returns 2;

Count

An array methods count the cardinal value of the given element.

const arr=[1,1,2,3];
arr.count(1) //returns 2;

getElements

An array method that extracts the elements from the array with the given count and condition.

Params

• count -Indicates the number of elements to be extracted from the array
• Function -a function that has the condition
• Key (1 or -1)
  • 1 selects the elements from the starting of the array.
  • -1 selects the elements from the end.

Example:

const myarr=[1,2,3,4];
myarr.getElements(2,x=>x%2==1);//return [1,3];
myarr.getElements(2,-1)//return [3,4]

Max

An array method returns the maximum value in the given array.

const arr=[12,3,4,56];
arr.max()//returns 56;

Min

An array method returns the minimum value in the given array.

const array=[1,2,3,4]
arr.min()//returns 1;  

MaxOccurence

An array method that returns the element which occurs the most in the array.

const arr=[1,2,3,4,5,3]
arr.getmostOccurence()//returns {value:3,occurences:2}

Median

An array method that returns the median of the elements in it.

const arr=[1,2,3]
arr.median()//returns 2;

Optimize

An array method that removes the undefined and null values in it.

const arr=[1,2,null,true,undefined,"naveeenkumar"]
arr.optimize()//returns [1,2,true,"naveenkumar"]

Remove

An array method that removes the element or an array of elements from it.

const array=[1,2,3,4];
array.remove(1) //returns [2,3,4]
array.remove([3,4]) //returns [1,2]
const arr=["naveen","kumar","md"]
arr.remove("naveen")//returns ["kumar","md"]
arr.remove(["naveen","md"])//returns ["kumar"]

Sortf

An array method that sorts the array in ascending or descending order.

Params

• key (optional, default value is 1)

  • 1 sorts the array in ascending order.
  • -1 sorts the array in descending order.

• function It has ths condition for sorting.(Optional).

Example

const arr=[1,2,4,3]
arr.sortf()//returns [1,2,3,4]
arr.sortf(-1)//returns [4,3,2,1]
const arr1=["naveen","kumar","md"]
arr1.sortf()//returns ["kumar","md,"naveen"]

Sum

An array method that returns the sum of the elements in it.

const arr=[1,2,3]
arr.sum()//returns 6

Unique

An array method that deletes the duplicate elements in it.

const arr=[1,3,5,2,3]
arr.ditinct()//returns[1,3,5,2]
const arr=["naveen","naveen"]
arr.distinct()//returns ["naveen] 

Number-methods

Armstrong

A number method that checks whether the number is an armstrong number or not.

const num=1634;
num.isArmstrong()//returns true
const num=1543;
num.isArmstrong()//returns false

Composite

A number method that checks whether the number is an composite number or not.

const num=7;
num.isComposite()//returns false;
const num1=14
num.isComposite()//returns true;

Prime

A number method that checks whether the number is an Prime number or not.

var num=3
num.isPrime()//returns true
num=4
num.isprime()//returns false;

Radian to degree

A number method that converts the value in radian to degree.

const a=0.7853981633974483
a.toDegree()//returns 45

Degree to radian

A number method that converts the value in ** degree to radian**.

const a=45;
a.toRadian()//returns 0.7853981633974483

Even

A number method that checks whether a given number is even or not.

var num=2;
num.isEven()//returns true;
num=3;
num.isEven()//returns false;

Odd

A number method that checks whether a given number is odd or not.

var num=3
num.isOdd()//returns true
num=4
num.isOdd()//returns false

Length

A number method that returns the number of digits in it.

var num=2334
num.length()//returns 4

Reverse

A number method that returns the reverse of it.

var num=1234
num.reverse()//returns 4321
num=100
num.reverse()//returns 1

String methods

Reverse

A string method that returns the reverse of it.

var str="naveen";
str.sreverse()//returns "neevan"

isEmpty

A string method checks whether a given string is empty or not.

var str=""
str.isEmpty()//returns true
str="   "
str.isEmpty()//returns true

Truncate

A string method that returns the string before the index or before the given string.

Params

index or string

const str="Naveen kumar"
str.truncate(3)//returns "Nav"
str.truncate(" ")//returns "Naveen"

Capitalize

A string method that capitalize the first letter itself.

var about="i am a good boy"
about.capitalize()//returns "I am a good boy"

Swap case

A string method that swaps the cases in it.

var name="Naveen Kumar"
name.swapcase()//returns "nAVEEN kUMAr"

Camel case

A string methods that returns the camel case version of it.

var name="naveen kumar"
name.camelCase()//returns naveenKumar

Endswith

A string method that checks whether it ends with the specified string or not.

const str="naveen kumar"
str.endsWith("kumar")//returns true;

Startswith

A string method that checks whether it starts with the specified string or not

const str="naveen kumar"
str.startsWith("na")//returns true

Math-methods

Sum

A function that returns the sum of given two numbers.

var x=sum(12,3)//returns 15

Subtract

A function that returns the difference of given two numbers.

var x=subtract(12,3)//returns 9

Multiply

A function that returns the product of given two numbers.

var x=product(12,3)//returns 36

Divide

A function that returns the quotient of given two numbers.

var x=divide(12,3)//returns 4

Modulo

A function that returns the modulo of given two numbers.

var x=subtract(12,3)//returns 0

Roundoff

A function that roundoff according to the given number of digits of given two numbers.

var x=roundoff(12.4567,3)//returns 12.457

Random

A function that returns the random number according to the number of digits and between two values.

Params

• Digits -Number of digits
• Min -Start limit
• Max -End limit

Example:

console.log(random(2))//returns 77 or something..
console.log(random(3,450,460))//returns 451 or something between 450 and 560

Palindrome

A function that checks whether the given string or number is a palindrome or not.

var str="dad"
isPalindrome(str)//returns true
str=1234321
isPalindrome(str)//returns true

Validations

Mail

A string method that validates the mail id.

const str="naveen9715568487@gmail.com"
str.validateMail()//returns true

Password

A string method that validates the password.

const pass="Naveen@1234"
pass.validatePass()//returns "strong"
const pass1="naveen8870499146"
pass1.validatePass()//returns "normal"
const pass2="naveenkumar"
pass2.validatePass()//returns "weak"