Add id to array of objects - Javascript

Question

I have an array of objects. How do I add an id key to them starting from 1.

[
{
    color: \"red\",
    value: \"#f00\"
},
{
    color: \"green\",
    value: \"         


        

Answer 1

You could use Array#forEach for this. The second argument of the callback refers to the index of the element. So you can assign the ID as index + 1.

const source = [{
    color: "red",
    value: "#f00"
  },
  {
    color: "green",
    value: "#0f0"
  },
  {
    color: "blue",
    value: "#00f"
  },
  {
    color: "cyan",
    value: "#0ff"
  },
  {
    color: "magenta",
    value: "#f0f"
  },
  {
    color: "yellow",
    value: "#ff0"
  },
  {
    color: "black",
    value: "#000"
  }
];

source.forEach((item, i) => {
  item.id = i + 1;
});

console.log(source);