Question

我想将数组拆分为偶数（或尽可能多的）块。函数的输入应为数组和块的大小。说你有数组

[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17]

如果将其放在下面的函数中（块大小为5），则会显示以下内容

[[1,2,3,4,5],[6,7,8,9,10],[11,12,13,14,15],[16,17]

但是，我希望结果是

[[1,2,3,4,5],[6,7,8,9],[10,11,12,13],[14,15,16,17]

这意味着先牺牲数组的长度，使它们的长度仅相差一个。

我当前正在使用的功能如下所述。我已经尝试过以模为单位的各种方法，但是我无法弄清楚。

function chunkArray(myArray, chunkSize){
var arrayLength = myArray.length;
var tempArray = [];

for (index = 0; index < arrayLength; index += chunkSize) {
    myChunk = myArray.slice(index, index+chunkSize);
    // Do something if you want with the group
    tempArray.push(myChunk);
}

return tempArray;

}

Answer 1

使用此解决方案，您可以平均分割数组项，直到最后一个合并了所有剩余项的项（长度小于块大小的项的集合）。

const a = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17]
const chunk = 4

const chunk_array = (a, c) => {
  let arr = []
  
  a.forEach((_, i) => {
    if (i%chunk === 0) arr.push(a.slice(i, i+chunk))
  })
  
  const [left_overs] = arr.filter(a => a.length < chunk)
  
  arr = arr.filter(a => a.length >= chunk)
  
  arr[arr.length-1] = [...arr[arr.length-1], ...left_overs] 
  
  return arr
}

console.log(
  chunk_array(a, chunk)
)

Answer 2

您可以用模来检查数组长度是否为奇数：

let MY_CHUNK_CONST = 5
let first_chunk_size = MY_CHUNK_CONST,
other_chunk_size = MY_CHUNK_CONST;
let myArray = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17];
modulo_res = myArray.length % 2; // 0 if even 1 if odd

if(modulo_res){
 other_chunk_size = first_chunk_size - 1;
}

var tempArray = [];

myChunk = myArray.slice(0, 0+first_chunk_size);
tempArray.push(myChunk);
for (index = 1; index < myArray.length; index += other_chunk_size) {
    myChunk = myArray.slice(index, index+other_chunk_size);
    // Do something if you want with the group
    tempArray.push(myChunk);
}

console.log(tempArray)
// [[1,2,3,4,5],[6,7,8,9],[10,11,12,13],[14,15,16,17]

希望有帮助。

Answer 3

我的解决方案！

const chunk = (arr, chunkSize) => {
  let chunked = [];
  for (let i = 0; i< arr.length; i+=chunkSize){
    chunked.push(
      arr.slice(i, (i + chunkSize))
    );
  }

  return chunked;
};

const data = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17];

console.log(chunk(data, 5));
// returns [[1,2,3,4,5],[6,7,8,9,10],[11,12,13,14,15],[16,17]]

如何将数组拆分为偶数长度的块？

3 个答案: