I want to check a string if it matches one or more other strings. In my example i just used 4 possible string values. How can i write this code shorter if i have to check for more values?

//Possible example strings: "ce", "c", "del", "log"
let str = "log"; //My input
console.log(str == "log" || str == "del" || str == "c" || str == "ce"); //Return if str has a match

I want to check a string if it matches one or more other strings. In my example i just used 4 possible string values. How can i write this code shorter if i have to check for more values?

//Possible example strings: "ce", "c", "del", "log"
let str = "log"; //My input
console.log(str == "log" || str == "del" || str == "c" || str == "ce"); //Return if str has a match

• javascript
• jquery
• regex
• algorithm
• if-statement

Share Improve this question Follow asked Dec 11, 2019 at 13:36 RoyBlunkRoyBlunk 611010 bronze badges 2

• What is the type of possible example strings? Is it an array? – Mayank Patel Commented Dec 11, 2019 at 13:39
• Better suited for codegolf.stackexchange. – nice_dev Commented Dec 11, 2019 at 13:55

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6 Answers 6

Sorted by: Reset to default 3

You could use string test here along with an alternation:

var input = "log";
if (/^(?:log|del|c|ce)$/.test(input)) {
    console.log("MATCH");
}
else {
    console.log("NO MATCH");
}

you could use string.match method

    let str = "log";

    var re = "^(log|del|c|cd)$";
    var found = str.match(re);

    if (found) ....

You could use the includes method on an array...

let str = "log";
let arr = ["log","del","c","ce"];
console.log(arr.includes(str));
// Or as a single statement...
console.log(["log","del","c","ce"].includes(str));

Alternatively you can use indexOf.

let stringToMatch = "log";

let matches = ["ce", "c", "del", "log"];

console.log(matches.indexOf(stringToMatch) !== -1);

You can use an array and its includes() function call:

let str = "log";
let criteria = ["log", "del", "c", "ce"];
console.log(criteria.includes(str));

You could have matching factory and then use it in any place where you need to do multiple matches.

const matchingFactory = (string) => new Proxy({}, {
  get(obj, key, receiver) {
     return (() => !!string.match(new RegExp(key, 'i')))()
  }

})

And then use it in any module or place in your code in the following way:

const _ = matchingFactory('log');

Then you could shorten your example to

console.log(_.log || _.del || _.c || _.ce); //Return if str has a match