control

select

Select one of two values using an i32 condition.

core0x1B

Syntax

select

Stack Effect

[t, t, i32] -> [t]

Opcode

Hex: 0x1B
Decimal: 27
Bytes: [0x1b]
Encoding: 0x1B
Category: parametric

Browser Support

Core WebAssembly instruction.

Validation Rules

Operands and result types must match the instruction signature.
The instruction must appear in a valid structured control context.

Common Mistakes

Using the instruction with the wrong operand type.
Forgetting that WAT validation is stack-typed.

Example

(func $example
  ;; select example
)