[英]How to extract values from a multidimensional array to form another array?
所以我有一個包含4個值的數組:項目,類別,已檢查,數字:
var MyArray = [
["coke", "beverages", "checked", 000],
["baguette", "bread", "checked", 001],
["water", "beverages", "checked", 000],
["pepsi", "beverages", "checked", 000],
["wholemeal", "bread", "checked", 001],
...
]
我如何制作更多數組來對它們進行如下分類:
var beverages = ["coke", "pepsi", "water"]; // more drinks from above array...
var bread = ["baguette", "wholemeal"]; // more types of bread from above array...
任何幫助,將不勝感激,謝謝!
您可以使用reduce
將項目分組。 使用每種食物作為關鍵字創建一個累加器對象。 Destructure
每個內部數組以獲得第一項和第二項。
var MyArray = [ ["coke", "beverages", "checked", 000], ["baguette", "bread", "checked", 001], ["water", "beverages", "checked", 000], ["pepsi", "beverages", "checked", 000], ["wholemeal", "bread", "checked", 001], ] const grouped = MyArray.reduce((r, [item, type]) => { r[type] = r[type] || []; r[type].push(item) return r; }, {}) const { bread, beverages } = grouped console.log(bread, beverages)
這就是grouped
對象的外觀。 您可以使用去屑獲得更多種類的食物
{
"beverages": [ "coke", "water", "pepsi" ],
"bread": [ "baguette", "wholemeal" ]
}
可能是這樣的:
var beverages = MyArray.map(data => data[0])
var bread = MyArray.map(data => data[1]);
等等。
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