Hari 24: TypedArray & Binary Data

TypedArray — Performa Tinggi

// Berbeda dengan Array biasa, TypedArray menyimpan data biner efisien
const int8  = new Int8Array([1, -128, 127]);
const uint8 = new Uint8Array([0, 128, 255]);
const float64 = new Float64Array([3.14, 2.72]);

// Operasi
const data = new Int32Array(5);
for (let i = 0; i < data.length; i++) data[i] = i * 10;
// [0, 10, 20, 30, 40]

// Konversi
Array.from(data); // [0, 10, 20, 30, 40]
[...data];        // sama

ArrayBuffer & DataView

// Buffer mentah
const buffer = new ArrayBuffer(8); // 8 byte
const view = new DataView(buffer);

// Tulis data
view.setInt32(0, 42, true);    // offset 0, little-endian
view.setFloat32(4, 3.14, true); // offset 4

// Baca data
console.log(view.getInt32(0, true));    // 42
console.log(view.getFloat32(4, true));  // 3.14