I have a node.js script where I want to find if a given string is included inside an array. how can I do this?
Thanks.
2
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I do not understand your question? You want to find a string inside an array? Please describe your question a little bit better. An commented example would be helpful. Some comments inside your fiddle would be also helpful to find out, what you want to know.apxp– apxp2016-01-24 13:01:52 +00:00Commented Jan 24, 2016 at 13:01
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edit. please look again if you have time.Eyal Cohen– Eyal Cohen2016-01-24 13:10:37 +00:00Commented Jan 24, 2016 at 13:10
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3 Answers
If I understand correctly, you're looking for a string within an array.
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.
Example:
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
The introduction of ES6 gives us :
arr.includes('str') //true/false
3 Comments
Eyal Cohen
hey, thank you. but, what if i want the string to be a var from the user? and also, where do i put the code for the match in my function? take a look on the jsfiddle. i am new on node.js , so thanks for your help.
xShirase
in that case,
var str = process.argv[2] should do the trickEyal Cohen
try to do that : jsfiddle.net/eyal4/qe0r1z26, and its give me an error. i want it also to print the full str - excectly evrey string that contain this str. its little bit hard i guess, but appreciate your help ! how could i do it clean?
In NodeJS, if you are looking to match a partial string in an array of strings you could try this approach:
const strings = ['dogcat', 'catfish']
const matchOn = 'dog'
let matches = strings.filter(s => s.includes(matchOn))
console.log(matches) // ['dogcat']
EDIT: By request how to use in context fiddle provided:
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))
}
3 Comments
Eyal Cohen
hey, thank you. but, what if i want the string to be a var from the user? and also, where do i put the code for the match in my function? take a look on the jsfiddle. i am new on node.js , so thanks for your help.
chriskelly
put it in a function for you. I am returning the list of matches and not a number like you had. Not sure if thats what you meant.
Eyal Cohen
ok, thanks, but ive been trying to do that jsfiddle.net/eyal4/qe0r1z26/1 like you said and thats not print nothing. how do i print evrey string that include that string and where do i put that on my code. thanks again
Another way is to use some
players = [];
const found = this.players.some(player => player === playerAddress);
if (found) {
// action
} else {
// action
}
