# assert/length Assert the length of a collection or string. Used inside `deftest` blocks. ## Syntax
[assert/length $xs $n]
## Parameters - `$xs` — collection or string to measure. - `$n` — expected length (number). ## Examples
[assert/length @{1 2 3} 3]
[assert/length $name 5]
## Returns `true` on success; raises a runtime error on failure. ## See Also `assert/not-empty?`, `assert/eq`, `deftest`