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djD-REK/cards.flatMap().js

Last active August 14, 2019 21:09
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cards.flatMap().js
const suits = ["♠️", "♣️", "♥️", "♦️", "🃏"];
const ranks = ["A", "K", "Q", "J", "🃏"];
console.log(suits.map((suit, index) => [ranks[index], suit]));
// result: [["A", "♠️"], ["K", "♣️"], ["Q", "♥️"], ["J", "♦️"], ["🃏", "🃏"]]
console.log(suits.flatMap((suit, index) => [ranks[index], suit]));
// result: ["A", "♠️", "K", "♣️", "Q", "♥️", "J", "♦️", "🃏", "🃏"]
// If for some reason you needed to use a depth > 1 for flat, you can't use flatMap
console.log(suits.map((suit, index) => [ranks[index], suit]).flat(Infinity));
// result: ["A", "♠️", "K", "♣️", "Q", "♥️", "J", "♦️", "🃏", "🃏"]
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