对象扁平化

[Sunny-117]

No description provided.

[ych-chen]

递归法：

let arr = [1, [2, [3, 4, 5]]];

function flatten(arr){
let result = [];
for(let i = 0; i < arr.length; i++){
if(arr[i] instanceof Array){
result = result.concat(flatten(arr[i]))
} else {
result.push(arr[i])
}
}
return result;
}
flatten(arr);

[kangkang123269]

楼上是数组扁平化

1. 递归

function flattenObject(obj, prefix = '', res = {}) {
  for (let key in obj) {
    let newKey = prefix ? `${prefix}.${key}` : key;
    if (typeof obj[key] === 'object' && obj[key] !== null && !(obj[key] instanceof Date)) { 
      flattenObject(obj[key], newKey, res);
    } else {
      res[newKey] = obj[key];
    }
  }
  return res;
}

2. 堆栈

function flattenObjectStack(obj) {
  const stack = [[[], obj]];
  const result = {};

  while (stack.length > 0) {
    const [keys, value] = stack.pop();

    if (typeof value === 'object' && value !== null && !(value instanceof Date)) { 
      for (let k in value) {
        stack.push([[...keys, k], value[k]]);
      }
    } else {
      result[keys.join('.')] = value;
    }
  }

  return result;
}