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local.set: Wasm text instruction

files/en-us/webassembly/reference/variables/local.set/index.md

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Original Source

The local.set instruction sets the values of a local variable.

{{InteractiveExample("Wat Demo: local", "tabbed-taller")}}

wat
(module
  (import "console" "log" (func $log (param i32)))
  (func $main

    (local $var i32) ;; create a local variable named $var
    (local.set $var (i32.const 10)) ;; set $var to 10
    local.get $var ;; load $var onto the stack
    call $log ;; log the result

  )
  (start $main)
)
js
const url = "{%wasm-url%}";
await WebAssembly.instantiateStreaming(fetch(url), { console });

Syntax

wat
;; load the number 2 onto the stack
i32.const 2

;; store the number 2 in the variable $val
local.set $val
InstructionBinary opcode
local.set0x21