CODEWITHSUNDEEP
javascriptarrayssetinterval
Mladen Stanojevic
Mladen Stanojevic

Reputation: 152

JavaScript array reorder in circle

I have javascript array that looks like this

var myArr = [1,2,3,4,5,6,7,8,9];

And I have a setInterval function on every second. And each time function is triggered I need to reorder the array to looks like this [2,3,4,5,6,7,8,9,1] and next time [3,4,5,6,7,8,9,1,2]... Whats the best way to do that.

Upvotes: 0

Views: 344

Answers (1)

Cerbrus
Cerbrus

Reputation: 72857

It's pretty simple: Use a combination of shift and push:

var myArr = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
console.log(myArr.join());

var myInterval = setInterval(
    function (){
        myArr.push(myArr.shift());
        console.log(myArr.join());
    },
    1000
);

setInterval() runs the supplied function every x milliseconds (1000, in this case),
shift() removes the first element from the array it's called on, and returns it,
push() adds the supplied parameter to the end of the array it's called on.

You can reverse the direction using unshift and pop:

var myArr = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
console.log(myArr.join());

var myInterval = setInterval(
    function (){
        myArr.unshift(myArr.pop());
        console.log(myArr.join());
    },
    1000
);

Upvotes: 9

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