demo · v135

Float16Array round-trip

Chrome 135 ships Float16Array — 2 bytes per number, IEEE 754 binary16. Type a value, see what survives the round-trip, and compare bytes against Float32 / Float64.

Float16Array: ?

Float16Array (Chrome 135+)

—
— bytes

Float32Array

—
— bytes

Float64Array

—
— bytes

the code

const a = new Float16Array([0.1, 0.2, 0.3]);
console.log(a[0]);                       // 0.0999755859375
console.log(a.byteLength / a.length);    // 2

const dv = new DataView(a.buffer);
console.log(dv.getUint16(0, true).toString(16)); // raw bits

see also