Examining which string, if any, in an array, serves as a superstring for another string in the array

Let me share with you this scenario:

var eventTypes = ['#course', '#bundle'];
var customEvent = ['#coursebar']

I am looking to determine if any of the strings in customEvent is a superstring (starts with) any value from the strings in eventTypes. If so, I want to return the first matching value.

I've experimented with using find and includes, but haven't been able to achieve the desired outcome. Most examples I came across dealt with comparing just one string against an array.

To make things clearer, here are some expected results:

var eventTypes = ['#course', '#bundle'];

// SCENARIO 1
var customEvent = ['#coursebar'] // should return '#coursebar'

// SCENARIO 2
var customEvent = ['#foo'] // should return undefined

// SCENARIO 3
var customEvent = ['#coursebar, #coursebaz'] // should return either '#coursebar' OR '#coursebaz'

I'm aware that accomplishing this using for loops is possible, but I'm curious if there's a more concise and modern approach available.

javascriptarrays

Answer №1

To determine if the elements in eventTypes are present in customEvent, you can utilize the combination of array#find and array#some.

const eventTypes = ['#workshop', '#training'],
  customEvent = ['#workshopbar, #trainingbaz'],
  result = customEvent.find(event => eventTypes.some(type => event.startsWith(type)));
console.log(result);

Answer №2

This code snippet appears to solve the issue:

customEvent.find((x) => eventTypes.find((y) => x.startsWith(y)))

Answer №3

To achieve the desired outcome, utilize filter in combination with some as demonstrated below:

let matches = customEvents.filter(event => eventTypes.some(type => event.startsWith(type)))

You can then access any specific element from the array matches

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