我有一个具有以下结构的对象数组:
let arr = [
{name: "abc", show: true , display:"ABC"},
{name: "xyz", show: false , display:"XYZ"},
{name: "pqr", show: true , display:"PQR"},
{name: "lmn", show: false , display:"LMN"}
]
我希望输出是两个数组,一个用于show:true
,另一个用于show:false
,即基于show
属性的值。理想情况下,一个可以同时给我两个数组的函数会很棒。我期待下一个输出:
arr1 = ["abc", "pqr"]
arr2 = ["xyz", "lmn"]
我目前的做法是:
// Approach I have tried so far:
var results = arr.filter(function(entry) {
return entry.show === false;
});
但这给了我一个对象数组,相反,我想要一个带有names
的数组。有人可以帮我吗?
答案 0 :(得分:1)
您可以使用 Chr Position Name AD REF ALT1 ALT2
0 1.0 866511.0 A 13,21 13 21 None
1 1.0 881627.0 A 28,33 28 33 None
2 2.0 1599812.0 B 67,25 67 25 None
3 3.0 5432.0 C 32,45,65 32 45 65
建立多维数组,然后将.reduce
推入索引name
(如果show为0
并推入索引{{1 }},例如show是false
:
1
答案 1 :(得分:1)
解决此问题的一种可能解决方案是使用Array.reduce()生成具有所需数组的对象,然后可以稍后访问这些数组。
let arr = [
{name: "abc", show: true , display:"ABC"},
{name: "xyz", show: false , display:"XYZ"},
{name: "pqr", show: true , display:"PQR"},
{name: "lmn", show: false , display:"LMN"}
];
var res = arr.reduce((acc, {show, name}) =>
{
if (show)
acc.show.push(name);
else
acc.noShow.push(name);
return acc;
}, {show:[], noShow:[]});
console.log("show => true", res.show);
console.log("show => false", res.noShow);
.as-console {background-color:black !important; color:lime;}
.as-console-wrapper {max-height:100% !important; top:0;}
答案 2 :(得分:0)
尝试一下:
let arr = [ {name: "abc", show: true , display:"ABC"},
{name: "xyz", show: false , display:"XYZ"},
{name: "pqr", show: true , display:"PQR"},
{name: "lmn", show: false , display:"LMN"}
]
const match = (bool) => arr.filter(res => res.show === bool).map(ele => ele.name);
console.log(match(true));
console.log(match(false));
答案 3 :(得分:0)
ForEach
每个对象,然后检查show属性。如果show == true
,则将内容推入一个数组,否则推入另一个数组
let arr = [{name: "abc",show: true,display: "ABC"},{name: "xyz",show: false,display: "XYZ"},{name: "pqr",show: true,display: "PQR"},{name: "lmn",show: false,display: "LMN"}]
let arr1 = [], arr2 = [];
arr.forEach((val, intt) => {
if (val.show) {
arr1.push(val.name)
} else {
arr2.push(val.name)
}
})
console.log(arr1);
console.log(arr2);
使用.map
可以通过返回数组来实现,如
let arr = [{name: "abc",show: true,display: "ABC"},{name: "xyz",show: false,display: "XYZ"},{name: "pqr",show: true,display: "PQR"},{name: "lmn",show: false,display: "LMN"}]
let arr1 = arr.map((val,intt) => { if (val.show) return val.name }).filter(n => n)
let arr2 = arr.map((val,intt) => { if (!val.show) return val.name }).filter(n => n)
console.log(arr1);
console.log(arr2)
这是相同的。在第一个函数中,我们仅返回具有show == true
的值,第二个闭包返回相反的值。我们使用array.filter(n => n)
来过滤空值
答案 4 :(得分:0)
使用类似Ramda.js的库可使解决方案简洁明了
const arr = [
{name: "abc", show: true , display:"ABC"},
{name: "xyz", show: false , display:"XYZ"},
{name: "pqr", show: true , display:"PQR"},
{name: "lmn", show: false , display:"LMN"}
]
const f = R.pipe(
R.partition(R.prop("show")),
R.map(R.pluck("name"))
)
console.log(f(arr))
<script src="//cdn.jsdelivr.net/npm/ramda@latest/dist/ramda.min.js"></script>