Function five ways

functionfiveways.js

const valueEquals = value => comparison => value === comparison;

const people = ['bob', 'sarah', 'kate', 'john', 'steve', 'stu', 'sam'];

people.filter(valueEquals('sarah'));
// returns an array value where any value equals sarah

people.find(valueEquals('bob'));
// returns the first value it finds ‘bob’

people.every(valueEquals('john'));
//returns false, since not every value equals ‘john’

people.some(valueEquals('steve'));
// returns true, since there’s a single value called steve

people.findIndex(valueEquals('kate'));
// returns 2, the index of kate