JSFiddle - React, Tailwind, and code Playground

HTML

<div id="out"></div>

JavaScript

let arr = [
  {name:"John", score: 12}, 
  {name:"Sylvia", score:15}, 
  {name:"Susan", score:22}
];
const reducer = (red, cur) => {
  red[cur.name] = cur.score;
  return red;
}
let scores = arr.reduce(reducer, {});

/** output **/
let out = document.getElementById("out");
out.innerHTML = JSON.stringify(scores);
console.log(scores);