在 node.js 中在数组上查找字符串的最佳方法是什么？
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what is the best way to find string on array in node.js?
提问by Eyal Cohen
up to jsfidlle my code, asked the same question yestrday but in java. i have a node.js script that run on cmd. i want to find if string that the user give me at the end of the command (with procces.argv[2]), is inclueded in my array how can i do this?
直到 jsfdlle 我的代码，昨天问了同样的问题，但在 Java 中。我有一个在 cmd 上运行的 node.js 脚本。我想查找用户在命令末尾给我的字符串（使用 procces.argv[2]）是否包含在我的数组中，我该怎么做？
link - https://jsfiddle.net/mj4761dk/
hope someone can help me. thank you
希望可以有人帮帮我。谢谢你
eyal
艾尔
回答by xShirase
If I understand correctly, you're looking for a string within an array.
如果我理解正确，您正在寻找数组中的字符串。
One simple way to do this is to use the indexOf()function, which gives you the index a string is found at, or returns -1 when it can't find the string.
一种简单的方法是使用该indexOf()函数，该函数为您提供找到字符串的索引，或者在找不到字符串时返回 -1。
Example:
例子：
var arr = ['example','foo','bar'];
var str = 'foo';
arr.indexOf(str); //returns 1, because arr[1] == 'foo'
str = 'whatever';
arr.indexOf(str); // returns -1
Edit 19/10/2017
编辑 19/10/2017
The introduction of ES6 gives us :
arr.includes('str') //true/false
ES6 的引入给了我们：
arr.includes('str') //true/false
回答by chriskelly
In NodeJS, if you are looking to match a partial string in an array of strings you could try this approach:
在 NodeJS 中，如果您想匹配字符串数组中的部分字符串，您可以尝试以下方法：
const strings = ['dogcat', 'catfish']
const matchOn = 'dog'
let matches = strings.filter(s => s.includes(matchOn))
console.log(matches) // ['dogcat']
EDIT:By requesthow to use in context fiddle provided:
编辑：通过请求如何在上下文小提琴中使用提供：
var fs = require('fs');
var location = process.cwd();
var files = getFiles('c:/Program Files/nodejs');
var matches = searchStringInArray('c:/Program Files/nodejs/node_modules/npm/bin', files);
console.log(matches);
function getFiles (dir, files_){
var str = process.argv[2];
files_ = files_ || [];
var files = fs.readdirSync(dir);
for (var i in files){
var name = dir + '/' + files[i];
if (fs.statSync(name).isDirectory()){
getFiles(name, files_);
} else {
files_.push(name);
}
}
return files_;
}
function searchStringInArray (find, files_) {
return files_.filter(s => s.includes(find))
}
