Parsing JSON to Map

makingMapsSucks.js

// Hard to read nested arrays.
const c = new Map([['a', 1], ['b', 2]])
console.log(c)

// Have to write using object wrapped in two layers of calls.
const d = new Map(Object.entries({ a: 1, b: 2}))
console.log(d)

parseJSONAsMap.js

let a = JSON.stringify({ a: { b: 2, c: 3 }, d: [4, 5] })

let b = JSON.parse(a, (key, value) => {
  if (typeof value === "object" && !Array.isArray(value)) {
    return new Map(Object.entries(value))
  } else {
    return value
  }
})

console.log(b)