如何重构此数组

Question

如果以前声明过宽度和高度，如何分解它们？

function test() {
  let height
  let width

  const viewBox = '0 0 24 24'
  const sizeArr = viewBox.split(' ')

  // ESLint is telling me to destructure these and I don't know how
  width = sizeArr[2]
  height = sizeArr[3]
}

Answer 1

您可以简单地将数组分解为已经声明的变量：

let height;
let width;

const viewBox = '0 0 24 24';
const sizeArr = viewBox.split(' ');

[width, height] = sizeArr.slice(2);

Answer 2

const[first，second，width，height]=sizer

Answer 3

您可以使用逗号来忽略数组中不需要的某些元素：

const [,,width,height] = sizeArr;

function test() {
  const viewBox = '0 0 24 24'
  const sizeArr = viewBox.split(' ')
  const [,,width,height]=sizeArr;
  console.log(width,height);
}
test();