How to move specific key value inside another array object in javascript

Question

I have array object obj how to move particular key value store inside another array items in javascript. I would like to know how to pass particular key value inside another array in javascript

var obj = [
  {
   id:1,
   store: "10",
   items: [{name:"sample1", total: 20}, {name:"sample2", total: 10}] // add store
  },
  {
   id:1,
   store: "11",
   items: [{name:"sample3", total: 10}, {name:"sample4", total: 10}] // add store
  }
]

function newarray(obj){
 return obj.map(e=>...e,e.items.map(i=>{...i,store: e.store })
}

Expected Output

[
  {
   id:1,
   store: "10",
   items: [{name:"sample1", total: 20, store: "10"}, {name:"sample2", total: 10, store: "10"}]
  },
  {
   id:1,
   store: "11",
   items: [{name:"sample3", total: 10, store: "11"}, {name:"sample4", total: 10, store: "11"}] 
  }
]

Answer 1

You are almost in the right direction, just few changes need to be done in your map function to get expected output:

 var obj = [ { id:1, store: "10", items: [{name:"sample1", total: 20}, {name:"sample2", total: 10}] }, { id:1, store: "11", items: [{name:"sample3", total: 10}, {name:"sample4", total: 10}] }]; var result = obj.map(val=>(val.items = val.items.map(p=>({...p,store:val.store})), val)); console.log(result);

Answer 2

You can use reduce and forech if you want to try a different approach

 var obj = [ { id:1, store: "10", items: [{name:"sample1", total: 20}, {name:"sample2", total: 10}] }, { id:1, store: "11", items: [{name:"sample3", total: 10}, {name:"sample4", total: 10}] } ] newob=obj.reduce((acc,curr)=>{ curr.items.forEach(x=>{ x.store=curr.store }) return [...acc,{...curr}] },[]) console.log(newob)