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return describe("named varargs", function()
it("should store varargs in named table", function()
local f
f = function(...)
local t = {
n = select("#", ...),
...
}
assert.same(t.n, 3)
assert.same(t[1], 1)
assert.same(t[2], 2)
return assert.same(t[3], 3)
end
return f(1, 2, 3)
end)
it("should handle string arguments", function()
local f
f = function(...)
local args = {
n = select("#", ...),
...
}
assert.same(args.n, 3)
assert.same(args[1], "a")
assert.same(args[2], "b")
return assert.same(args[3], "c")
end
return f("a", "b", "c")
end)
it("should handle empty varargs", function()
local f
f = function(...)
local t = {
n = select("#", ...),
...
}
assert.same(t.n, 0)
return assert.same(#t, 0)
end
return f()
end)
it("should preserve nil values", function()
local f
f = function(...)
local args = {
n = select("#", ...),
...
}
assert.same(args.n, 5)
assert.same(args[1], 1)
assert.same(args[2], nil)
assert.same(args[3], 3)
assert.same(args[4], nil)
return assert.same(args[5], 5)
end
return f(1, nil, 3, nil, 5)
end)
it("should work with loop", function()
local f
f = function(...)
local t = {
n = select("#", ...),
...
}
local sum = 0
for i = 1, t.n do
if type(t[i]) == "number" then
sum = sum + t[i]
end
end
return sum
end
local result = f(1, 2, 3, 4, 5)
return assert.same(result, 15)
end)
it("should handle mixed types", function()
local f
f = function(...)
local args = {
n = select("#", ...),
...
}
local types
do
local _accum_0 = { }
local _len_0 = 1
for i = 1, args.n do
_accum_0[_len_0] = type(args[i])
_len_0 = _len_0 + 1
end
types = _accum_0
end
return types
end
local result = f("string", 123, true, nil, { })
return assert.same(result, {
"string",
"number",
"boolean",
"nil",
"table"
})
end)
it("should work with table access", function()
local f
f = function(...)
local t = {
n = select("#", ...),
...
}
local first = t[1]
local last = t[t.n]
return {
first,
last
}
end
local result = f(1, 2, 3, 4, 5)
return assert.same(result, {
1,
5
})
end)
it("should support select with named args", function()
local f
f = function(...)
local args = {
n = select("#", ...),
...
}
local second = select(2, table.unpack(args))
return second
end
local result = f("a", "b", "c")
return assert.same(result, "b")
end)
it("should work with pcall", function()
local f
f = function(...)
local t = {
n = select("#", ...),
...
}
local success = true
for i = 1, t.n do
if t[i] == nil then
success = false
end
end
return success
end
local result = f(1, nil, 3)
return assert.is_false(result)
end)
it("should handle function results", function()
local g
g = function()
return 1, 2, 3
end
local f
f = function(...)
local t = {
n = select("#", ...),
...
}
return t.n
end
local result = f(g())
return assert.same(result, 3)
end)
it("should work with unpacking", function()
local f
f = function(...)
local args = {
n = select("#", ...),
...
}
return {
table.unpack(args)
}
end
local result = f("a", "b", "c")
return assert.same(result, {
"a",
"b",
"c"
})
end)
it("should support passing named varargs to another function", function()
local outer
outer = function(...)
local t = {
n = select("#", ...),
...
}
return inner((table.unpack(t)))
end
local inner
inner = function(a, b, c)
return {
a,
b,
c
}
end
local result = outer(1, 2, 3)
return assert.same(result, {
1,
2,
3
})
end)
it("should work with default parameter", function()
local f
f = function(x, ...)
if x == nil then
x = 10
end
local t = {
n = select("#", ...),
...
}
return x + t[1] or 0
end
local result = f(5, 15)
return assert.same(result, 20)
end)
return it("should handle single argument", function()
local f
f = function(...)
local t = {
n = select("#", ...),
...
}
return {
t.n,
t[1]
}
end
local result = f(42)
return assert.same(result, {
1,
42
})
end)
end)
|
