Software / code / prosody
Diff
spec/util_array_spec.lua @ 11787:3ae6fa901a8b
util.array: Add :slice() method + tests
Behaviour follows the same logic as string.sub (so yes, 1-indexed).
| author | Matthew Wild <mwild1@gmail.com> |
|---|---|
| date | Sun, 12 Sep 2021 10:50:20 +0100 |
| parent | 10590:257dc26e8e65 |
| child | 13245:ffe4adbd2af9 |
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--- a/spec/util_array_spec.lua Sun Sep 12 10:31:02 2021 +0100 +++ b/spec/util_array_spec.lua Sun Sep 12 10:50:20 2021 +0100 @@ -148,6 +148,25 @@ end); end); + describe("slice", function () + it("works", function () + local a = array({ "a", "b", "c" }); + assert.equal(array.slice(a, 1, 2), array{ "a", "b" }); + assert.equal(array.slice(a, 1, 3), array{ "a", "b", "c" }); + assert.equal(array.slice(a, 2, 3), array{ "b", "c" }); + assert.equal(array.slice(a, 2), array{ "b", "c" }); + assert.equal(array.slice(a, -4), array{ "a", "b", "c" }); + assert.equal(array.slice(a, -3), array{ "a", "b", "c" }); + assert.equal(array.slice(a, -2), array{ "b", "c" }); + assert.equal(array.slice(a, -1), array{ "c" }); + end); + + it("can mutate", function () + local a = array({ "a", "b", "c" }); + assert.equal(a:slice(-1), array{"c"}); + assert.equal(a, array{"c"}); + end); + end); end); -- TODO The various array.foo(array ina, array outa) functions
