让我们说我有一个Javascript数组看起来如下:

["Element 1","Element 2","Element 3",...]; // with close to a hundred elements.

什么样的方法适合将数组分成许多更小的数组,假设最多有10个元素?


当前回答

你可以使用Array.prototype.reduce函数在一行中完成这项工作。

让arr = [1,2,3,4]; 函数块(arr, size) { 令result = arr。减少((行,键,索引)=>(索引%大小== 0 ?rows.push([主要]):行[rows.length-1] .push(关键))& &行,[]); 返回结果; } console.log(块(arr), 2));

其他回答

# in coffeescript
# assume "ar" is the original array
# newAr is the new array of arrays

newAr = []
chunk = 10
for i in [0... ar.length] by chunk
   newAr.push ar[i... i+chunk]

# or, print out the elements one line per chunk
for i in [0... ar.length] by chunk
   console.log ar[i... i+chunk].join ' '

我认为这是ES6语法的一个很好的递归解决方案:

Const chunk =函数(数组,大小){ If (!array.length) { 返回[]; } Const head = array。片(0,大小); Const tail = array.slice(size); 返回[头,…块(尾巴,大小)]; }; 块console.log(((1、2、3),2));

一行程序

const chunk = (a,n)=>[...Array(Math.ceil(a.length/n))].map((_,i)=>a.slice(n*i,n+n*i));

为打印稿

const chunk = <T>(arr: T[], size: number): T[][] =>
  [...Array(Math.ceil(arr.length / size))].map((_, i) =>
    arr.slice(size * i, size + size * i)
  );

DEMO

const块= (n) = >[…]数组(Math.ceil (a.length / n))) . map ((_, i) = > a.slice (n * n + n * i)); document . write (JSON。Stringify (chunk([1,2,3,4], 2)));

按组数分组

const part=(a,n)=>[...Array(n)].map((_,i)=>a.slice(i*Math.ceil(a.length/n),(i+1)*Math.ceil(a.length/n)));

为打印稿

const part = <T>(a: T[], n: number): T[][] => {
  const b = Math.ceil(a.length / n);
  return [...Array(n)].map((_, i) => a.slice(i * b, (i + 1) * b));
};

DEMO

Const部分= (a, n) => { const b = Math.ceil(a。长度/ n); 返回数组(n)[…]。Map ((_, i) => .slice(i * b, (i + 1) * b)); }; document . write (JSON。Stringify (part([1,2,3,4,5,6], 2))+'<br/>'); document . write (JSON。Stringify (part([1,2,3,4,5,6,7], 2)));

你可以使用这个ES6块函数,它很容易使用:

Const chunk = (array, size) => Array.from({长度:Math.ceil(数组。Length / size)}, (value, index) =>数组。切片(索引*大小,索引*大小+大小)); const itemsPerChunk = 3; const inputArray = [a, b, c, d, e, f, g的); const newArray = chunk(inputArray, itemsPerChunk); console.log (newArray.length);/ / 3, document . write (JSON.stringify (newArray));/ / [[' a ', ' b ', ' c '], [' d ', ' e ', ' f '], [g]]

ES6传播功能#ohmy #ftw

Const chunk = (size, xs) => xs.reduce ( (segments, _, index) => 索引%大小=== 0 ? […段,x。Slice (index, index + size)] 段, [] ); console.log(块(3,(1,2,3,4,5,6,7,8)));