JS programming Little Practice-New Ket &imweb

7-12

(1) Find the position of the element item in the given array arr:

function IndexOf (arr, item) {    var flag =-1;    for (var key in arr) {        if (arr[key] = = Item) {            flag = key;        }    }    return flag;}

(2) calculates the sum of all the elements in the given array of arr

function sum (SRR) {     var sum = 0;     for (var key in arr) {         sum + = Arr[key];     }     return sum; }

(3) Remove the array of all values in arr that are equal to item, do not directly modify the array arr, the result returns the new Year's arrays

function Remove (arr,item) {     var newArr = [];     for (var key in arr) {         if (Arr[key]) {             newarr.push (Arr[key]);         }     }     return NEWARR; }

7-13

(1) Add the element item at the end of the array arr. Do not directly modify the array arr, the result returns a new array

function Append (arr, item) {    var newarr=[];    Newarr=arr.slice (0);    Newarr.push (item);    return NEWARR;}

(2) Delete the first element of the array arr. Do not directly modify the array arr, the result returns a new array

function Curtail (arr) {    var newarr=[];    Newarr=arr.slice (0);    Newarr.shift ();    return NEWARR;}

(3) Add the element item to the index of the array arr. Do not directly modify the array arr, the result returns a new array

function Insert (arr, item, index) {    var newarr=[];    Newarr=arr.slice (0);    Newarr.splice (Index,0,item);    return NEWARR;}

Not to be continued ...

JS programming Little Practice-New Ket &imweb