// Array :- It is collection more the single value inside an variable // filter(): extract the element from array which is satisfy the condition // array.filter(callback(currentvalue,index,arr),thisArg) // callback - It represents the function that test the condition. // currentvalue - The current element of array. // index - It is optional. The index of current element. // arr - It is optional. The array on which filter() operated. // thisArg - It is optional. The value to use as this while executing callback. const arr1=[1,2,3,4,5,6,7,8] const arr2=arr1.filter(function(value){ return value<5}) console.log(arr1); console.log(arr2);