assertcheck v1.0.0

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assertcheck / assert / idempotent

Function: idempotent()

function idempotent<T>(
   fn, 
   arg, 
   opts?): void;

Defined in: src/assert.ts:1804

Asserts that fn(fn(x)) equals fn(x) (idempotent function).

Type Parameters

Type Parameter
T

Parameters

Parameter	Type
fn	(v) => T
arg	T
opts?	Opts

Returns

void

Example

`assert.idempotent(normalizeEmail, "Alice@Example.COM")`