Extended Numeric Literals

[MaxGraey]

Search Terms

• extended-numeric-literals
• extended numeric literals

Suggestion

Support tc39/proposal-extended-numeric-literals (Stage 1)

Use Cases

For represent lengths in pixels, inches, degrees, radians, seconds and other units without calling specifically conversion methods in runtime (if this possible).

const time = 100s // transforms to `100,000` ms
const angle = 180° // transforms to `3.1415926536` radians

Examples

function deg(value: number): number {
   return value * (Math.PI / 180);
}

function °(value: number): number {
   return deg(value);
}

function _f32(value: number): number {
  return Math.fround(value);
}

function _u32(value: number): number {
  return value >>> 0;
}

function px(value: number): string {
  return `${ value }px`;
}

var angle = 30deg; // transforms to `0.5235987756`
const angle2 = 180°; // transforms to `pi` (`3.1415926536`)
let count = 1_000_000_u32;
var float32 = 1.0_f32;
canvas.style.width = 512px; // transforms to "512px" string

Also related to #15096

[Shinigami92]

I think that would be a great feature, but also that it could cause confusion for newbies who would read code from teammates

[Kingwl]

I don't think this will reach stage-3 in the near future (1-3 years)
and it is ugliness

[MaxGraey]

This is already used with the arrival of BigInt. And with success has taken hold in such modern languages ​​like Rust, Ruby, Swift

[Shinigami92]

@MaxGraey So I think that this feature is related to Javascript, not Typescript

[MaxGraey]

If this will land in JavaScript it should support by Typescript as well, isn't it? String templating with tags has been pretty useful feature. Extended numeric literals just like templating but for numbers

[Shinigami92]

If this will land in JavaScript it should support by Typescript as well, isn't it?

@MaxGraey Yes it is

[RyanCavanaugh]

Closing since there's nothing for us to do but wait for TC39