我制作了一个看起来像这样的锯齿状阵列:
我试图弄清楚如何计算每一行的平均数。有什么建议吗?
这里是完整的代码:
var tempen = [
[" ","00-08","08-16","16-24","Medel"],
["Malmö","12","16","9"," "],
["Mariestad","13","15","10"," "],
["Stockholm","13","15","13"," "],
["Göteborg","13","14","12"," "]
];
function printit()
{
var varMyinnerHTML = "<table border='1'>";
for (i=0;i<tempen.length;i++)
{
varMyinnerHTML +="<tr>";
for (j=0;j<tempen[i].length;j++)
{
varMyinnerHTML +="<td>"+ tempen[i][j] +"</td>";
}
varMyinnerHTML +="</tr>";
}
varMyinnerHTML +="</table>";
document.getElementById("kontainer").innerHTML=varMyinnerHTML;
}
</script>
</head>
<body>
<h1>Uppgift 1</h1>
<form name="f1">
<input type="button" value="print" onclick="printit()"/>
</form>
<div id="kontainer"/>
</body>
</html>
答案 0 :(得分:0)
const sum = (nos)=> nos.reduce((p,c)=> p + (+c), 0);
const avg = (nos)=> sum(nos) / nos.length;
const tail = ([_, ...tail])=> tail;
const averages = (arr) => arr.map((i) => avg(tail(i)));
var myArray = [["Help", "12", "16", "9", " "], ["Me", "13", "15", "10", " "], ["Please", "13", "15", "13", " "], ["Sir", "13", "14", "12", " "]];
console.log(averages(myArray));
或者,如果添加了composition operator:
const averages = (arr)=> arr.map(tail :> avg);