CODEWITHSUNDEEP
javascriptarraysramda.js
user1163073
user1163073

Reputation: 317

Test whether value exists within array of objects

I have an array of objects and I would like to test it to determine whether a property with a certain value exists (at least one occurrence) and for it to return a boolean value to indicate the result. I'm using the Ramda library and have been experimenting with the has function to try and achieve this, however this only returns a boolean on whether the actual property exists and not it's respective value.

const data = [
    {
        id: 10004,
        name: 'Daniel',
        age: 43,
        sport: 'football'
    },
    {
        id: 10005,
        name: 'Tom',
        age: 23,
        sport: 'rugby'
    },
    {
        id: 10006,
        name: 'Lewis',
        age: 32,
        sport: 'football'
    },
];

Checking the array of objects for sport: 'rugby' should return true and sport: 'tennis' should return false.

Any help will be greatly appreciated, thanks.

Upvotes: 3

Views: 6983

Answers (2)

Scott Sauyet
Scott Sauyet

Reputation: 50797

If you're looking for a Ramda solution, this would do fine:

R.filter(R.propEq('sport', 'rugby'))(data)

R.has, as you noted, just checks whether an object has the named property. R.propIs checks whether the property is of the given type. R.propEq tests whether the property exists and equals a given value, and the more generic R.propSatisfies checks whether the property value matches an arbitrary predicate.

Upvotes: 12

user4227915
user4227915

Reputation:

You can try this function:

function myFind(data, key, value) {
    return data.some(function(obj){
        return key in obj && obj[key] == value;
    });
}

Reference: Array.some()

Upvotes: 2

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