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配列メソッドを使ったTips

array
logic

Posted at 2012-08-14

var arr = [[0, 1, 2, 3], [4, 5, 6, 7]];

//2次元配列の最初の値だけ返す
var firstItems = arr.map(function (x) { return x[0]; });

//有効な要素だけをフィルタリング（excludes null, undefined, 0, etc…)
var enableItems = firstItems.filter(function (x) { return x; });

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