USE of ForEach in JavaScript let friends = [ 'Vasu' , 'Mohit' , 'Sunil' , 'Abhishek' ]; // using forEach friends . forEach ( myFunction ); function myFunction ( item ) { console . log ( item ) } . .. Output Vasu Mohit Sunil Abhishek // For changing in each element or if you want to something random or same value with each Elecment of array - Use below code let friends = [ 'Vasu' , 'Mohit' , 'Sunil' , 'Abhishek' ]; // using forEach friends . forEach ( myFunction ); function myFunction ( item , index , arr ) { arr [ index ] = 'Hello ' + item ; } console . log ( friends ) .. Output : - [ 'Hello Vasu' , 'Hello Mohit' , 'Hello Sunil' , 'Hello Abhishek' ] FOR vs ForEach both can be used to manipulate Array const oldArray = [ 'item1' , 'item2' , 'item3' ]; const newArray = []; // using for loop for ( let i = 0 ; i < oldArr...