Parse string of key value pairs where key occurs multiple times into object

July 14, 2022

I have a string in the following format:

"foo: bar, foo: baz, some: thing, some: other, third: other"

And what i want is an object:

{ 
  foo: [bar, baz],
  some: [other, thing],
  third: [other]
}

How could I achieve this in a smart way?

>Solution :

You can simply split on , leaving you with the key value pairs. Then you can split each pair on : and then add the key into an object and store the values in an array.

let str = "foo: bar, foo: baz, some: thing, some: other, third: other";

let obj = {};
str.split(", ").forEach((pair) => {
    let [key, value] = pair.split(": ");
  if (obj[key]) {
    obj[key].push(value);
  } else {
    obj[key] = [value];
  }
});
console.log(obj);