var beats = ["512", "1024", "1536"]
var beat = '600'
beats = beats.filter(item => +item - +beat <= 0)
console.log(beats)var beats = ["512", "1024", "1536"]
var beat = '600'
beats = beats.filter(item => +item - +beat >= 0)
console.log(beats)var beats = ["512", "1024", "1536"]
var beat = '600'
let filteredBeats = beats.map(item => (+item - +beat).toString()).filter(item => +item >= 0)
console.log(filteredBeats)
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let arr = [ ["british", "classic-rock"], ["pop"], ["rock", "classic-rock"] ]["british", "classic-rock"]
["pop"]
["rock", "classic-rock"]arr отфильтровать по другому массиву ["british", "pop"]arr есть что-то из ЭЛЕМЕНТОВ массива ["british", "pop"], то этот ЭЛЕМЕНТ массива arr - оставляем. arr не содержит то он нам не нужен.let filteredArray = [ ["british", "classic-rock"], ["pop"] ]arr[0][0] == ["british", "pop"][0] и arr[1][0] == ["british", "pop"][1]