Float Formatting
JS-faithful float printing: floats print the shortest decimal string that round-trips to the same value, exactly as JavaScript's Number.prototype.toString does — replacing the old bare-%g formatting that truncated to 6 significant digits. See
// The classic floating-point example: full precision is preserved.
/** @type {float64} */
const sum = 0.1 + 0.2
console.log(sum) // 0.30000000000000004
// Shortest representation — no spurious trailing digits.
/** @type {float64} */
const tenth = 0.1
console.log(tenth) // 0.1
// Integer-valued floats print without a decimal point.
/** @type {float64} */
const whole = 42.0
console.log(whole) // 42
// Many significant digits are kept.
/** @type {float64} */
const pi = 3.141592653589793
console.log(pi) // 3.141592653589793
console.log(`pi ≈ ${pi}`) // pi ≈ 3.141592653589793
// Special values match JavaScript.
console.log(NaN) // NaN
console.log(Infinity) // Infinity
console.log(-Infinity) // -Infinity
// Very large / very small magnitudes switch to exponential notation.
/** @type {float64} */
const large = 1000000000000.0 * 1000000000000.0
console.log(large) // 1e+24
/** @type {float64} */
const small = 1.0 / 10000000.0
console.log(small) // 1e-7View source on GitHubexamples/basics/float-formatting.ts