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index.html
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<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<link rel="stylesheet" href="./index.css">
</head>
<body>
<script>
const flatMapDepth = (arr, iteratee, depth = 1) => {
let newArr = [];
arr.forEach(el => {
const align = (arr, depth) => {
if (Array.isArray(arr[0])){
const deepAlign = align(arr[0], depth);
if (deepAlign < depth) {
return deepAlign + 1
} else if(deepAlign >= depth) {
return arr[0];
}
return deepAlign;
} else {
return 1;
}
};
const itElem = iteratee(el);
const slice = align(itElem, depth);
Array.isArray(slice) ? newArr.push(...slice) : newArr.push(itElem);
});
return newArr;
};
function duplicate(n) {
return [[[[[n, n]]]]];
}
console.log(flatMapDepth([1, 2], duplicate, 5));
</script>
</body>
</html>