Ways to identify which arrays within an object contain an element

Question

Ways to identify which arrays within an object contain an element

This question is unique as it pertains to objects of arrays rather than arrays of objects. I am working with a data structure like the one below and my goal is to determine if any of the arrays inside the object have values.

What I'm looking for is a simple true/false response indicating whether any of the arrays contain at least one value. I also appreciate efforts made towards finding a solution in my own answer.

let pendingAdditions = {
  hospitals: ['Silencio Hospital','St Judes'],
  licenses: ['poetic license'],
  medschools: []
}

javascript arrays javascript-objects

Answer 1

Answer №1

After scouring the internet, I came up empty-handed. Perhaps the answer is more straightforward than anticipated:

let somePendingAdditions = Object.values(pendingAdditions).some(arr => arr.length);

Alternatively, there is another solution that may not be as efficient but comes with its own set of potential pitfalls:

somePendingAdditions = 
    Boolean(Array.prototype.concat.apply([], Object.values(pendingAdditions)).length);

The issue at hand relates to providing the correct first argument for apply. Typically, this is achieved using {} or null, yet in the former scenario, {} becomes an element within the resulting array; while using null leads to an error.

Answer 2

After scouring the internet, I came up empty-handed. Perhaps the answer is more straightforward than anticipated:

let somePendingAdditions = Object.values(pendingAdditions).some(arr => arr.length);

Alternatively, there is another solution that may not be as efficient but comes with its own set of potential pitfalls:

somePendingAdditions = 
    Boolean(Array.prototype.concat.apply([], Object.values(pendingAdditions)).length);

The issue at hand relates to providing the correct first argument for apply. Typically, this is achieved using {} or null, yet in the former scenario, {} becomes an element within the resulting array; while using null leads to an error.

Answer 3

Answer №2

What do you think about using Object.values along with flat and includes?

// Implementing a function to check if Object has value as arrays and atleast one value is present
const hasAnyEntry = (items) => Object.values(items).flat().length > 0;

const pendingAdditions = {
  hospitals: ['Silencio Hospital','St Judes'],
  licenses: ['poe-tic license'],
  medschools: []
}
console.log(hasAnyEntry(pendingAdditions));
console.log(hasAnyEntry({}));


// Function to check if given entry exists in Object value arrays
const hasEntry = (items, entry) => Object.values(items).flat().includes(entry);

console.log(hasEntry(pendingAdditions, 'St Judes'));
console.log(hasEntry(pendingAdditions, 'Blah'));

Answer 4

What do you think about using Object.values along with flat and includes?

// Implementing a function to check if Object has value as arrays and atleast one value is present
const hasAnyEntry = (items) => Object.values(items).flat().length > 0;

const pendingAdditions = {
  hospitals: ['Silencio Hospital','St Judes'],
  licenses: ['poe-tic license'],
  medschools: []
}
console.log(hasAnyEntry(pendingAdditions));
console.log(hasAnyEntry({}));


// Function to check if given entry exists in Object value arrays
const hasEntry = (items, entry) => Object.values(items).flat().includes(entry);

console.log(hasEntry(pendingAdditions, 'St Judes'));
console.log(hasEntry(pendingAdditions, 'Blah'));

Ways to identify which arrays within an object contain an element

Answer №1

Answer №2

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