javascript - 将给定值与多维数组进行比较

Question

我真的需要你的帮助。

我想像下面这样构造和构建一个数组:

var provinces = [
    ['Ontario','ON'],
    ['Quebec','QC'],
    ['British Columbia','BC'],
    ['Saskatchewan','SK']
];

然后，id 喜欢将值 (x) 与我的数组进行比较，即:

var x = 'Ontario'

if (x matches the value in the array list 'provinces') { then let x = ON }

你怎么用 javascript 写这样的东西？

非常感谢您的帮助，

Answer 1

使用 .filter() 函数接收真/假返回条件以从数组中检索元素:

var provinces = [
    ['Ontario','ON'],
    ['Quebec','QC'],
    ['British Columbia','BC'],
    ['Saskatchewan','SK']
];

var x = "Ontario";

//Find if any array item matches the word
var result = provinces.filter(function(item) {
  return item[0] == x;
});

//If there's a match, get the second index from the first result from the filter
if(result.length > 0)
  x = result[0][1];

alert(x);