How can i join json objects and adding a new attribute inside of

Question

I have some json objects, i want to join all of the objects only in one

i have this input

a:[{h:1, i:2}]
b:[{j:1, k:2}]
c:[{l:1, m:2}]

i need this output

[{type: a, h:1, i:2}, {type: a, o:1, p:2}, {type: b, j:1, k:2}, {type: c, l:1, m:2}]

i was trying:

const a = {"a":[{"h":1, "i":2}]}
const b = {"b":[{"j":1, "k":2}]}
const c = {"c":[{"l":1, "m":2}]}

const result = {};
let key;

for (key in a) {
  if(a.hasOwnProperty(key)){
    result[key] = a[key];
  }
}


for (key in b) {
  if(b.hasOwnProperty(key)){
    result[key] = b[key];
  }
}

console.log('b', result)

Answer 1

To combine the objects in thea,b, andcarrays into a single array, you can use themapandconcatmethods of the Array prototype. Themapmethod allows you to transform the elements in an array, and theconcatmethod allows you to merge two arrays into one.

Here's an example of how you could use these methods to combine the objects in youra,b, andcarrays into a single array:

const a = [{h: 1, i: 2}];
const b = [{j: 1, k: 2}];
const c = [{l: 1, m: 2}];

const result = [].concat(
  a.map(obj => Object.assign({type: "a"}, obj)),
  b.map(obj => Object.assign({type: "b"}, obj)),
  c.map(obj => Object.assign({type: "c"}, obj))
);

After running this code, theresultarray will contain the combined objects from thea,b, andcarrays, with thetypeproperty added to each object. The output will look like this:

[
  {type: "a", h: 1, i: 2},
  {type: "b", j: 1, k: 2},
  {type: "c", l: 1, m: 2}
]