JavaScript Map function Regarding Array of objects...
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script>
var arr = [
[5 ,4 ,7 ,2 ,3 ],
[3 ,7 ,5 ,8 ,2 ],
[1 ,2 ,1 ,3 ,4 ],
[5 ,1 ,4 ,2 ,6 ],
[8 ,1 ,3 ,2 ,8 ]
];
var sum = 0;
document.write("The length of the array is = "+arr.length+"<br>");
for(var i = 0; i < arr.length; i++){
for(var j = 0; j < arr[i].length; j++){
if(j == i){
sum = sum + arr[i][j];
}
}
}
document.write("The sumation is = "+sum);
</script>
</head>
<body>
</body>
</html>
expected output is :
The length of the array is = 5
The sumation is = 23
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