将给定值与多维数组进行比较

Question

我真的需要你的帮助。

我想构建一个像下面这样的数组:

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

然后，我想比较值(x)与我的数组，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?

非常感谢你的帮助，

Answer 1

使用.filter()函数，它接收一个true/false返回条件从数组中检索项:

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);