interchange array using shift method

Question

I am trying to interchange array and print it using shift method but not sure whether I can use it or not.

var points = [40, 100, 1, 5, 25, 10];

//trying to achieve like anotherPoints array
//var anotherPoints = [1, 5, 100, 40, 25, 10];

for (index = 0; index < points.length; index++) {
  points.shift();
  console.log(points);
}

score 0 · Answer 1 · edited May 23 '17 at 12:06

The shift() method doesn't shift or interchange the elements of an Array. It is similar to pop(), but it pops out the first element from the Array.

For example,

var points = [40, 100, 1, 5, 25, 10];
console.log(points.shift());  // 40
console.log(points); // [100, 1, 5, 25, 10]

As to your requirement of rearranging the elements of an Array, you will have to use Array.splice() method. Check out this question Reordering arrays.

score 0 · Accepted Answer · answered Mar 06 '15 at 09:20

Some logic to get the desired result:

var points = [40, 100, 1, 5, 25, 10],
    temp1 = [], temp2 = [], anotherArray;
points.forEach(function(val){
    if(val < 10 ) {
        temp1.push(val)
    } else {
        temp2.push(val);   
    }
});
anotherArray = temp1.sort().concat(temp2.sort(function(a,b){return b- a}));
alert(anotherArray);

It's not possible via shift or splice. Unless manually creating the array.

interchange array using shift method

2 Answers2