💾arr.removeDuplicates()

JS ⟩ value ⟩ object⟩ built-in ⟩ Array ⟩ extension ⟩ arr.removeDuplicates()

💾 程式

• replit

Object.defineProperties(Array.prototype, {
    // 🔹 .removeDuplicates()
    removeDuplicates: {
        value: function() {
            return [... new Set(this)];    // new array (non-mutating)
        },
    },
});

💈範例

[ 1, 1, 2, 3, 2, 3, 4 ].randomElement,       // (random)
[ 1, 1, 2, 3, 2, 3, 4 ].removeDuplicates(),  // [ 1, 2, 3, 4 ]
[1].concat([1,2,3],[2,3,4]),                 // [ 1, 1, 2, 3, 2, 3, 4 ]
[1].union([1,2,3],[2,3,4]),                  // [ 1, 2, 3, 4 ]

⬇️ 應用

• 各班平均及前三名

• arr.uniqueMerge()

• keyword - list all keywords.

• contextual keyword - list all contextual keywords.

👥 相關

• Set