Reproduced: Flat multidimensional array

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function init (arr) {
    var newArr = [];
    if (arr instanceof Array) {
        arr.forEach(function (value) {
            newArr = newArr.concat(init(value));
        });
    } else {
        newArr.push(arr);
    }
    return newArr;
}
 
init([1, [2], [3, [[4]]]]);
 

Disclaimer: This article is a blogger original article, follow the CC 4.0 BY-SA copyright agreement, reproduced, please attach the original source link and this statement.

This link: https://blog.csdn.net/sinat_17775997/article/details/77507562