Question

174

How to access array in circular manner in JavaScript

rated 0 times [ 178] [ 4] / answers: 1 / hits: 34332 / 11 Years ago, fri, july 5, 2013, 12:00:00

I have an array like [A,B,C,D]. I want to access that array within a for loop like as

var arr = [A,B,C,D];



var len = arr.length;

for(var i = 0; i<len; i++){

    0 - A,B,C

    1 - B,C,D

    2 - C,D,A

    3 - D,A,B

}

I want to access that like in JavaScript, any ideas?

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lara

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answered 11 Years ago kristineterrak · Accepted Answer

Try this:

var arr = [A,B,C,D];

for (var i=0, len=arr.length; i<len; i++) {

    alert(arr.slice(0, 3).join(,));

    arr.push(arr.shift());

}

Without mutating the array, it would be

for (var i=0, len=arr.length; i<len; i++) {

    var str = arr[i];

    for (var j=1; j<3; j++)

        str += ,+arr[(i+j)%len]; // you could push to an array as well

    alert(str);

}

// or

for (var i=0, len=arr.length; i<len; i++)

    alert(arr.slice(i, i+3).concat(arr.slice(0, Math.max(i+3-len, 0)).join(,));