Array API: array.find()

Array.prototype.find makes finding items in arrays easier

takes a compare function

const found = [true].find(true); assert.equal(found, true);

returns the first value found

const found = [0, 1].find(item => item > 1); assert.equal(found, 2);

returns undefined when nothing was found

const found = [1, 2, 3].find(item => item === 2); assert.equal(found, void 0);

combined with destructuring complex compares become short

const bob = {name: 'Bob'}; const alice = {name: 'Alice'}; const found = [bob, alice].find(({name}) => name); assert.equal(found, alice);

Related Katas

Array API

• array.sort() basics
• array.sort() can take a compare function
• array.shift() (as introduced in ES3)
• array.push() (as introduced in ES3)
• Array.from()
• Array.of()
• array.fill()
• array.find()
• array.findIndex()
• array.entries()
• array.keys()
• array.values()
• array.includes()
• array.toReversed()

Difficulty Level

TBD

First Published

29 April 2015

Stats

4 tests to solve