javascript中的lambda表示式 find() filter() map()
阿新 • • 發佈：2022-03-24
javascript中的lambda表示式
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<script>
var nubList = [
{
expressId: "00001", //快遞單號ID
expressNum: "資料1"
},
{
expressId: </span><span style="color: rgba(0, 0, 255, 1)">var</span> nub = nubList.find(nub => nub.expressId == <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">00002</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">);
console.log(nub.expressId);
</span><span style="color: rgba(0, 0, 255, 1)">var</span> nub1 = nubList.filter(nub => nub.expressId == <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">00002</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">);
console.log(nub1[</span><span style="color: rgba(128, 0, 128, 1)">0</span><span style="color: rgba(0, 0, 0, 1)">].expressId);
</span></script>
</body>
</html>
資料來自網上。
find和filter這兩個的區別是：
find返回的是一條資料；
filter返回的是一個數組；
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<!DOCTYPE html>
<html>
<head>
</head>
<body>
<script>
var nubList = [
{
expressId: "00001", //快遞單號ID
expressNum: "資料1"
},
{
expressId: "00002", //快遞單號ID
expressNum: "資料2"
},
{
expressId: "00003", //快遞單號ID
expressNum: "資料3"
},
{
expressId: "00004", //快遞單號ID
expressNum: "資料4"
}
];
</span><span style="color: rgba(0, 0, 255, 1)">var</span> nub = nubList.find(nub => nub.expressId == <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">00002</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">);
console.log(nub.expressId);
</span><span style="color: rgba(0, 0, 255, 1)">var</span> nub1 = nubList.filter(nub => nub.expressId == <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">00002</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">);
console.log(nub1[</span><span style="color: rgba(128, 0, 128, 1)">0</span><span style="color: rgba(0, 0, 0, 1)">].expressId);
</span></script>
</body>
</html>
資料來自網上。
find和filter這兩個的區別是：
find返回的是一條資料；
filter返回的是一個數組；
https://www.cnblogs.com/subendong/p/9246804.html