Less or equal

The le instructions, short for less or equal, check if a number is less than or equal to another number. If the first number is less than or equal to the second number equal 1 will be pushed on to the stack, otherwise 0 will be pushed on to the stack.

The integer types have separate less or equal instructions for signed (le_s) and unsigned (le_u) numbers.

Try it

(module (import "env" "log_bool" (func $log_bool (param i32))) (func $main ;; load `10` and `2` onto the stack i32.const 10 i32.const 2 i32.le_u ;; check if `10` is less than or equal to '2' call $log_bool ;; log the result ) (start $main) ) 
const url = "{%wasm-url%}"; function log_bool(value) { console.log(Boolean(value)); // Expected output: false } await WebAssembly.instantiateStreaming(fetch(url), { env: { log_bool }, }); 

Syntax

wat
;; load 2 numbers on to the stack local.get $num i32.const 2 ;; check if $num is less than or equal to '2' i32.le_u ;; if $num is less than or equal to the `2`, `1` will be pushed on to the stack, ;; otherwise `0` will be pushed on to the stack. 
Instruction Binary opcode
i32.le_s 0x4C
i32.le_u 0x4D
i64.le_s 0x57
i64.le_u 0x58
f32.le 0x5F
f64.le 0x65