assertcheck v1.0.0

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assertcheck / assert / uniqueBy

Function: uniqueBy()

function uniqueBy<T>(
   arr, 
   iteratee, 
   opts?): void;

Defined in: src/assert.ts:1138

Asserts that all elements are unique when mapped through iteratee. Equivalent to Ruby arr.uniq { |x| x.key }.length == arr.length.

Type Parameters

Type Parameter
T

Parameters

Parameter	Type
arr	T[]
iteratee	ValueIteratee<T>
opts?	Opts

Returns

void

Example

`assert.uniqueBy(users, "email", "duplicate emails")`