Introduction to Web Assembly

The two main types of numbers we care about are floating points and integers.

Floating Point

142.24

Integer

142

JavaScript only has floating point numbers but most environments don't display the dot after a number.

21.000
// 21

Note: Number.MAX_SAFE_INTEGER shows the largest integer that can be safely used in JavaScript.

Under the hood, numbers in JavaScript are 64-bit floating points whereas in Web Assembly all memory pointers are 32-bits.

This is important because understanding memory is fundemental to working with Web Assembly.