[英]How to split a string into an array at a given character (Javascript)
[英]how to split array into given number in javascript
我有一个数组,我必须将它拆分为给定的数字,如果(剩余数组大小 < given_no/2),最后一个拆分的数组应该容纳剩余的元素
例如
var arr = [1,2,3,4,5,6,7,8,9,10,11]
if given_no 2 = Math.round(arr.length/2)= chunk_size 6 = [[1,2,3,4,5,6],[6,7,8,9,10]]
if given_no 3 = Math.round(arr.length/3)= chunk_size 4 = [[1,2,3,4],[5,6,7,8],[9,10,11]]
if given_no 4 = Math.round(arr.length/4)= chunk_size 3 = [[1,2,3],[4,5,6],[7,8,9],[10,11]]
首先 Math.round(arr.length/2) 将返回 6 而不是 5。请参见下面的代码。 我创建了 splitArr function ,它将根据给定的数字返回拆分数组。
var arr = [1,2,3,4,5,6,7,8,9,10,11]; console.log('Given 2: ' + JSON.stringify(splitArr(arr, 2))); // given 2 console.log('Given 3: ' + JSON.stringify(splitArr(arr, 3))); // given 3 console.log('Given 4: ' + JSON.stringify(splitArr(arr, 4))); // given 4 console.log('Given 5: ' + JSON.stringify(splitArr(arr, 5))); // given 5 console.log('Given 6: ' + JSON.stringify(splitArr(arr, 6))); // given 6 function splitArr(arr, given) { var arrSize = arr.length var split = Math.round(arrSize/given); var returnArr = []; var loopCount; for(i = 0; i < given; i++){ loopCount = (i*split)+split; loopCount = loopCount > arrSize? arrSize: loopCount; var innerArr = arr.slice((i*split), loopCount) returnArr.push(innerArr); } if(loopCount < arr.length){ innerArr.push(...arr.slice(loopCount, arrSize)); } return returnArr; }
您可以使用Math.round()
和array.slice()
。
var splitArray = (arr, num) => { let result = []; let size = Math.round(arr.length/num); for (let i=0; i<num; i++) { let end = i === num-1? arr.length: (i+1) * size; result.push(arr.slice(i*size, end)); } return result; } var arr = [1,2,3,4,5,6,7,8,9,10,11]; console.log(JSON.stringify(splitArray(arr, 2))); console.log(JSON.stringify(splitArray(arr, 3))); console.log(JSON.stringify(splitArray(arr, 4))); console.log(JSON.stringify(splitArray(arr, 5)));
function splitintochunks(arr,l){
let result=[];
while(arr.length>0){
result.push(arr.splice(0,l));
}
return result;
}
//EXAMPLE: call in the below way spltIntoChunks([1,2,3,4,5,6,7,8,9,10,11],5);
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