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Practical WebAssembly

The Start Function

Learn how to use the start function in WebAssembly.

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The start function is a special function that runs after the WebAssembly module is initialized. Let’s take the same example that we used for the globals. We add the following content to globals.wat:

C++
(module
  ; Code is elided
  (func $initMutableValue
    (global.set $mutableValue
     (i32.const 200)))
  (start $initMutableValue)
)

We define the initMutableValue function, which sets mutableValue to 200. After that, we add a start block, which starts with the start keyword followed by the name of the function. ...