Все методы работы с массивами Javascript, которые вам нужно знать!

[🟣🟡🟣🟡].map(🟣,🟥) => 🟥🟥🟥🟥

[🟡🟣🟥🟡].filter(🟡) => 🟡🟡🟡

[🟥🟥🟡🟡].find(🟡) => 🟡

[🟥🟥🟥🟣].findIndex(🟣) => 3

[🟡🟡🟡🟡].fill(1,🟥) => 🟡🟥🟥🟥

[🟥🟡🟡🟥].some(🟡) => True

[🟣🟡🟡🟥].every(🟣) => False

[🟡🟣🟣🟣].reduce((🟣,🟠)=>🟣+🟠, 0) => 🟡🟡🟡🟡

[🟣🟣🟡🟡].includes(🟣) => True

[🟡🟡🟥🟣].indexOf(🟥) => 2

[🟡🟥🟥🟡].lastIndexOf(🟥) => 2

[🟥🟡🟡🟥].sort() => 🟡🟡🟥🟥

[🟣🟣🟡🟥].reverse() => 🟥🟡🟣🟣

[🟣, 🟡].concat([🟠, 🟠]) => 🟣🟡🟠🟠

[🟡🟡🟡🟡].slice(1,3) => 🟡🟡

[🟣🟣🟡🟡].splice(1,2,🟥🟥) => 🟣🟥🟥🟡

[🟡🟡🟣🟡].join(' - ') => 🟡 - 🟡 - 🟣 - 🟡

[🟡🟡🟣🟣].pop() => 🟣 [🟡🟡🟣]

[🟣🟡🟣🟡].shift() => 🟣 [🟡🟣🟡]

[🟡🟡🟣].push(🟥) => 🟡🟡🟣🟥

[🟣🟡🟡].unshift(🟥) => 🟥🟣🟡🟡

[🟣🟡🟣🟥].copyWithin(2, 0, 2) => 🟣🟡🟣🟡

[🟣🟣🟥🟥].fill(🟩, 2) => 🟣🟣🟩🟩

[🟣, 🟥, 🟩].concat([🟡, 🟡]) => 🟣🟥🟩🟡🟡