Parametric

drop

Remove the top value from the stack.

Example:

(i32.const 42)
(drop)  ;; Remove 42 from stack

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select

Select one of two values based on a condition.

Signature: (param T T i32) (result T)

Example:

;; Returns first value if condition is non-zero, else second
(select
  (i32.const 10)
  (i32.const 20)
  (i32.const 1))  ;; Returns 10

;; Can specify type
(select (result i32)
  (i32.const 42)
  (i32.const 0)
  (i32.eqz (local.get $x)))

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