如何从具有相同键的数组创建嵌套对象（javascript）

Question

arr = ["sadik", "arif", "rahman"]

I want to create a nested object with the same key but different value like:

{ 
  subcategory: {
    name: sadik
    subcategory: {
      name: arif
      subcategory: {
        name: rahman
      }
    }
  }
}

my code:

let arr = ['sadik', 'arif', 'babor']
let obj = {}
arr.forEach((elem) => {
  let a = {}
  a["subcategory"] = {name:elem}
  Object.assign(obj, a)
})

i get only last value:

{
subcategory: {
   name:"babor"
  }
}

Answer 1

Your code did not work because you were replacing your "subcategory" key value in each iteration. You have change the reference object to the next nested level each time to get the expected output, see the working snippet below:

 const arr = ['level-1', 'level-2', 'level-3'] const obj = {} let refObj = obj; arr.forEach( ele => { refObj = refObj['subcategory'] || refObj; refObj['subcategory'] = { 'name': ele}; }) console.log('output', obj);