js无限数组降维实现

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js无限数组降维实现

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function reduceDimension(arr){
    let ret = [];
    
    let toArr = function(arr){
        arr.forEach(function(item){
            item instanceof Array ? toArr(item) : ret.push(item);
        });
    }

    toArr(arr);

    return ret;
}

let arr = [[12], 4, [333, [4444, 5555]], [9, [111, 222]]];

for(let i = 0; i < 100000; i++){
    arr.push(i);
}

let start = new Date().getTime();

console.log('reduceDimension: ', reduceDimension(arr));
console.log('耗时: ', new Date().getTime() - start);
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