过滤以JavaScript中的字母开头的列表元素 [英] Filter a list element starting with a letter in JavaScript

问题描述

我正在尝试将以'N'开头的列表元素整理成新列表。
为什么这不起作用？

I am trying to sort out list elements that starts with 'N' into a new list. Why won't this work?

const countries = ['Norway', 'Sweden',  'Denmark', 'New Zealand'];

function firstN(){
  for (let i=0;i<countries.length;i++){
    countries[i].startsWith("N")
    }
}

let startsWithN = countries.filter(firstN())

推荐答案

这与@ adeneo的回答大致相同，只是一点点：

This is roughly the same as @adeneo's answer, just a little terser:

const countries = ['Norway', 'Sweden',  'Denmark', 'New Zealand'];

const startsWithN = countries.filter((country) => country.startsWith("N"));

console.log(startsWithN);

// Output: [ 'Norway', 'New Zealand' ]

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