javascript - 过滤数组以便按数据类型对项目进行分组

Question

我明白了:

var arr= ["three", "2", "five", "ten", "111", 1, 2, "forty", "33", 33];

我需要它是 2 个新数组 一个只有数字，另一个只有字符串

像这样:

var strArr = ["three", "2", "five", "ten", "111","forty", "33"];
var numArr = [1, 2, 33];

我应该怎么做？

Answer 1

您可以将 typeof operator 与 filter 方法结合使用，该方法接受一个回调 函数作为参数。

The filter() method creates a new array with all elements that pass the test implemented by the provided function.

var arr= ["three", "2", "five", "ten", "111", 1, 2, "forty", "33", 33];
var numbers = arr.filter(function(item){
  return typeof item == 'number';
});
var strings = arr.filter(function(item){
  return typeof item == 'string';
});
console.log(numbers);
console.log(strings);

您可以使用 arrow 函数来实现轻型解决方案。

['number', 'string'].map(i => arr.filter(a => typeof a == i));