js—reduce方法练习之无限引用对象的值
<!DOCTYPE html>
<html>
<head>
<title>数组的reduce方法</title>
</head>
<body>
</body>
<script type="text/javascript">
var obj = {
a:{
b:{
c:"maomin"
}
}
}
const safeGet = (obj, path) => {
try {
return path.split('.').reduce((o, k) => o[k], obj)
} catch (e) {
return undefined
}
}
console.log(safeGet(obj,'a.b.c'));// maomin
// 其他练习
var str = "1,2,3,4";
var arr = str.split(",");
var newArr = arr.map(Number);
console.log(newArr);
var sum = newArr.reduce(function(prev, cur, index, arr) {
console.log(prev, cur, index);
return prev + cur;
},0)
// 0 1 0
// 1 2 1
// 3 3 2
// 6 4 3
</script>
</html>
更多内容请见原文，原文转载自：http://www.mark-to-win.com/tutorial/50906.html
