How to pull conditional values from lists inside javascript objects

Question

I have an object, with a list inside each key. What is the best way of returning the key, if the url string matches what's in the array.

For example in the code below, 'entertainment' would be returned as "/video" is in the entertainment array.

const url = "https://example.com/video";

const verticalList = {
    autos:[],
    entertainment:["/video", "/tech"],
    foodanddrink:[],
    healthandfitness:[],
    homepage:["/home"],
    lifestyle:["/ideas", "/executive-life"],
    money:["/money-markets",],
    news:["/briefing"],
    sports:[],
    travel:[],
    weather:[]
}

mickl · Accepted Answer · 2020-02-17 03:57:14Z

4

You can use Object.entries to get a list of key-value pairs from your object and then run Array.filter to compare values against your url. In the last step you have to run Array.map to retrieve corresponding keys. String.includes can be used to check if one string is a substring of another.

const url = "https://example.com/video";

const verticalList = {
    autos:[],
    entertainment:["/video", "/tech"],
    foodanddrink:[],
    healthandfitness:[],
    homepage:["/home"],
    lifestyle:["/ideas", "/executive-life"],
    money:["/money-markets",],
    news:["/briefing"],
    sports:[],
    travel:[],
    weather:[]
}

let matches = Object.entries(verticalList)
                    .filter(([key,value]) => value.some(x => url.includes(x)))
                    .map(([key,value]) => key);

console.log(matches)

answered Feb 17, 2020 at 3:57

mickl

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2 Comments

Jonathan Devereux Over a year ago

Thanks, it works great I don't fully understand what's going on, but I will read up on all these new methods on mozilla!

mickl Over a year ago

@JonathanDevereux sure - it's really good to get familiar with them - they can make your like easier :)

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