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Rounding change to the right in javascript

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[前端(javascript) 所属分类 前端(javascript) | 发布者 店小二05 | 时间 2018 | 作者 红领巾 ] 0人收藏点击收藏

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javascript Array rotate() 14 answers

I have this array:

var arr1 = ['a1', 'a2', 'a3', 'a4', 'a5'];

I need to shift it to right by say 2 locations, like

arr1 = ['a4', 'a5', 'a1', 'a2', 'a3'];

This works for left shift:

arr1 = arr1.concat(arr1.splice(0,2)); // shift left by 2

I get :

arr1 = ['a3', 'a4', 'a5', 'a1', 'a2'];

But I don't know how to do shift right...

Shift to right to N positions == shift to left to array.length - N positions.

So to shift right on 2 positions for you array - just shift it left on 3 positions.

There is no reason to implement another function as soon as you already have one. Plus solutions with shift/unshift/pop in a loop barely will be as efficient as splice + concat

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