Test for arrays intersections with array.some

array-some.js

// array some helps keeping code succinct when looking for occurences in arrays

const firstArray = ['shark', 'fish', 'dinosaur']
const secondArray = ['whale', 'shark', 'bird']
const thirdArray = ['raptor', 'tuna']

// determine wether 2 arrays have a similar entry
const bool1 = firstArray.some(animal => secondArray.some(otherAnimal => otherAnimal === animal))
console.log("bool1", bool1) // true, "shark" is in both arrays

const bool2 = firstArray.some(animal => thirdArray.some(otherAnimal => otherAnimal === animal))
console.log("bool2", bool2) // false, firstArray and thirdArray have no similar entry