I have an array looking like this:
arr = ['a', 'b', 'c', 'd', 'e', 'f'];
How can I shift its values while maintaining the order. For instance, I'd like to start it with 'd':
new_arr = shiftArray(arr, 'd'); // => ['d', 'e', 'f', 'a', 'b', 'c']
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Are you sure your array is always unique?a-d– a-d2015-07-09 12:38:42 +00:00Commented Jul 9, 2015 at 12:38
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Yes, it's populated by unique file-namesidleberg– idleberg2015-07-09 12:39:32 +00:00Commented Jul 9, 2015 at 12:39
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@idleberg Is it okay if your original array is tampered in the process?thefourtheye– thefourtheye2015-07-09 12:50:41 +00:00Commented Jul 9, 2015 at 12:50
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@thefourtheye yeah, that's fineidleberg– idleberg2015-07-09 13:29:56 +00:00Commented Jul 9, 2015 at 13:29
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2 Answers
You can do something like this
function shiftArray(arr, target){
return arr.concat(arr.splice(0,arr.indexOf(target)));
}
var arr = ['a', 'b', 'c', 'd', 'e', 'f'];
function shiftArray(arr, target){
return arr.concat(arr.splice(0,arr.indexOf(target)));
}
alert(shiftArray(arr, 'd'));
1 Comment
a-d
it will modify the original array, is it ok?
This will not modify the original array, also I recommend you rename the function
function rotateArrayAround(array, pivotNeedle) {
var pivot = array.indexOf(pivotNeedle);
return array.slice(pivot).concat(array.slice(0, pivot));
}
