assertcheck v1.0.0

---

assertcheck / assert / one

Function: one()

function one<T>(
   arr, 
   predicate, 
   opts?): void;

Defined in: src/assert.ts:947

Asserts that exactly one element satisfies the predicate — Ruby one?.

Type Parameters

Type Parameter
T

Parameters

Parameter	Type
arr	T[]
predicate	(v) => boolean
opts?	Opts

Returns

void

Example

`assert.one(events, e => e.type === "checkout", "exactly one checkout expected")`