[4, 5, 6, 7].at(1) // 5
[4, 5, 6, 7].push(8) // [4, 5, 6, 7, 8]
[4, 5, 6, 7].pop() //[4, 5, 6, ]
[4, 5, 6, 7].fil(1) //[1, 1, 1, 1]
[4, 5, 6, 7].join(' ') //'4 5 6 7 '(string)
[4, 5, 6, 7].shift() //[ 5, 6, 7]
[4, 5, 6, 7].reverse() //[7, 6, 5, 4]
[4, 5, 6, 7].unshift(3) // [3, 4, 5, 6, 7]
[4, 5, 6, 7].includes(6) //true
[4, 5, 6, 7].map(item => 2*item) // [8, 10, 12, 14]
[4, 5, 6, 7].filter(item => item > 5) //[6,7]
[4, 5, 6, 7].find(item => item > 5) //6 (first match)
[4, 5, 6, 7].every(item => item > 0) // true
[4, 5, 6, 7].findIndex(item => item === 5) // 1
[4, 5, 6, 7].reduce((prev, curr) => prev+curr, 0) //22
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