Bairdy•2y ago

prototype dot functions. How?

How would I go about creating dot function that can be chained at the end of a number in Deno? Example: (2).toUSD() // returns $2.00

function toUSD(amount) {
  // RETURN Something..
  return new Intl.NumberFormat("en-US", {
    style: "currency",
    currency: "USD"
  }).format(amount);
},

function toUSD(amount) {
  // RETURN Something..
  return new Intl.NumberFormat("en-US", {
    style: "currency",
    currency: "USD"
  }).format(amount);
},

2 Replies

Beast•2y ago

you would have to extend prototype of a Number, but please don't do that, you can just do toUSD(2)

ud2•2y ago

If https://github.com/tc39/proposal-call-this eventually gets implemented, you might be able to write

function toUSD() {
  return new Intl.NumberFormat("en-US", {
    style: "currency",
    currency: "USD",
  }).format(this);
}

2~>toUSD() // returns $2.00

function toUSD() {
  return new Intl.NumberFormat("en-US", {
    style: "currency",
    currency: "USD",
  }).format(this);
}

2~>toUSD() // returns $2.00

GitHub

GitHub - tc39/proposal-call-this: A proposal for a simple call-this...

A proposal for a simple call-this operator in JavaScript. - GitHub - tc39/proposal-call-this: A proposal for a simple call-this operator in JavaScript.