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<script>
// 去重
var arr = [
{ name: '張三', id: 1, integral: 10 },
{ name: '李四', id: 2, integral: 20 },
{ name: '王五', id: 3, integral: 30 },
{ name: '趙六', id: 4, integral: 40 },
{ name: '王五', id: 3, integral: 10 },
{ name: '王五', id: 3, integral: 80 },
{ name: '趙六', id: 4, integral: 20 },
]
console.log(arrayUnique2(arr, 'id'), 'name')
/*
reducer 函數接收4個參數:
Accumulator (acc) (累計器)
Current Value (cur) (當前值)
Current Index (index) (當前索引)
Source Array (srcArray) (源數組)
*/
function arrayUnique2(arr, name) {
var hash = {};
return arr.reduce(function (acc, cru,index) {
if (!hash[cru[name]]) {
hash[cru[name]] = {index:index}
acc.push(cru)
}else{
acc.splice(hash[cru[name]]['index'],1,cru)
}
return acc;
}, []);
}
</script>
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