Question 198388 in Javascript Question posted in
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Javascript – Determine if a string contains any of an array of characters

If I have a number of characters (either as a string or an array), does JavaScript have a function to tell me if any of those characters appear within a string?

For example, given the following, I want a function that returns true because str does contain one of the characters in chars.

const chars = [ '[', ']', '{', '}' ];
var str = "BlahBlah}";

In C#, I can use IndexOfAny(), but I’m not finding a similar function in JavaScript.

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4

Answers


  1. 0

    Try this

    const chars = [ '[', ']', '{', '}' ];
const str = "BlahBlah}";

const result = chars.some(x=>str.includes(x))

console.log(result)
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  2. 0

    JS contains metod includes. For example:

    const chars = [ '[', ']', '{', '}' ];
var str = "BlahBlah}";

for (const i of str) {
  if (chars.includes(i)) {
    console.log(i);
  }
}
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  3. 0

    ES6 automates looping through arrays with Array.prototype.some().

    Try:

    substrings.some(function(v) { return str.indexOf(v) >= 0; })

    Or, to prototype this to String yourself (not recommend):

    String.prototype.indexOfAny = function(arr) {
    return arr.some(function(v) { return str.indexOf(v) >= 0; });
}
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  4. 0

    Reusable Functional Approach

    const chars = [ '[', ']', '{', '}' ];
const str = "BlahBlah}";

const chars2 = [ '[', ']', '{', '}' ];
const str2 = "Amoos";


const findStringInArray = (string, array) => array.some( arr =>string.includes(arr) )


console.log( findStringInArray(str, chars) )



console.log( findStringInArray(str2, chars2) )
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