Array Methods & Functions

JavaScript File

       
// For Each Method
// 3 parameter , first aaray, second gives index , third give whole array
let a = [12, 50, 56, 100, 200];
document.writeln("For Each Method : ");
a.forEach((n) => {
    document.writeln(n);
});


// Map Mthods
// Map method has 3 parameter , can access, Element , index, and Array !
document.writeln("

 Map Method - Array Squares:");

let arr = a.map((n) => n*n);
document.writeln(arr);

document.writeln("

");

// Filter Method, returns new array based on Conditions 
let arr2 = a.filter((n) => true);

document.writeln("Fliter Methods, All Array : ",arr2, "

");

// Filter based on condtions 
let arr3 = a.filter((n) => n > 50);
document.writeln("Fliter Methods, Based on Conditions , n > 50: ",arr3);
// Create array , 10 items , filter array =< 40

document.writeln("

");


// First ans.map returns the square of an array, 
//  seconds ans2 filter out square which is < 100, which is 4, 81
let arr4 = [43, 65, 322, 2, 9, 200];
let ans = arr4.map((n) => n * n);
let ans2 = ans.filter((n) => n < 100);
document.writeln("First find Square using map, then filter which is < 100 : ",ans2);

document.writeln("

");


// Reverse An Array
let rev = arr4.reverse((n) => n);
document.writeln("Reverse Method :",rev);
Array Methods & Functions

JavaScript File

JavaScript Output :
