mrf.js

// map 
// syntax 
// variable name.map()(value,index,actualarray)=>) : v i a is an sample for value, index and actual array

    // [map] method i is an integer with 0, 1, 2, 3, 4 in each box : 0+5 =5, 1+5=6, 2+5=7
let a = [10,20,30,40,50]
let b = a.map((v,i,a)=>i+5)
console.log(b);

let a =[10,20,30,40,50,60]
let b=a.map((v,i,a)=>v-5)
console.log(b);



// [Filter ]: task use comparision operator 
// syntax value, index , array , itteration 

let a = [10,20,30,40,50]
let b = a.filter((v,i,a)=>v>=40)
console.log(b);

let ab =[20,40,80,100]
let cv =ab.filter((v,i,a)=>v>=80)
console.log(cv);

 let a = [10,20,30,40,50]
let b = a.filter((v,i,a)=>v>=40)
console.log(b);

/// [reduce method] - reduce means getting array value finds the array value
 let red = [10,20,30,40,50]
 let ret = red.reduce((x,y)=>x+y)
 console.log(ret);