Convert String into Array of Objects: JS

Question

I have the following string:

const str = "Tuba|203488|Music Theory|301071"

I would like to convert it to an array of objects like so:

[
{specialty: "Tuba",
userid:203488},
{specialty: "Music Theory",
userid:301071}
]

How can I do this in javascript?

Answer 1

Here is a solution making these assumptions:

• values in input string are separated by |
• values are in a set of two, the first one is the specialty (string value), the second one the userid (number value)
• result should be an array of objects of format: [{ specialty: String, userid: Number }]

The solution first splits the input string on |, then uses a .reduce() to build the resulting array of objects:

const str = "Tuba|203488|Music Theory|301071";

let result = str.split('|').reduce((acc, val, idx, arr) => {
  if(idx % 2) {
    acc.push({
      specialty: arr[idx - 1],
      userid: Number(val)
    });
  }
  return acc;
}, []);
console.log(result);

Output:

[
  {
    "specialty": "Tuba",
    "userid": 203488
  },
  {
    "specialty": "Music Theory",
    "userid": 301071
  }
]