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|
return describe("table comprehension", function()
it("should create simple table copy", function()
local thing = {
color = "red",
name = "fast",
width = 123
}
local thing_copy
do
local _tbl_0 = { }
for k, v in pairs(thing) do
_tbl_0[k] = v
end
thing_copy = _tbl_0
end
assert.same(thing_copy.color, thing.color)
assert.same(thing_copy.name, thing.name)
return assert.same(thing_copy.width, thing.width)
end)
it("should filter with when clause", function()
local thing = {
color = "red",
name = "fast",
width = 123
}
local no_color
do
local _tbl_0 = { }
for k, v in pairs(thing) do
if k ~= "color" then
_tbl_0[k] = v
end
end
no_color = _tbl_0
end
assert.same(no_color.color, nil)
assert.same(no_color.name, "fast")
return assert.same(no_color.width, 123)
end)
it("should transform values", function()
local numbers = {
a = 1,
b = 2,
c = 3
}
local doubled
do
local _tbl_0 = { }
for k, v in pairs(numbers) do
_tbl_0[k] = v * 2
end
doubled = _tbl_0
end
assert.same(doubled.a, 2)
assert.same(doubled.b, 4)
return assert.same(doubled.c, 6)
end)
it("should transform keys", function()
local data = {
a = 1,
b = 2
}
local upper_keys
do
local _tbl_0 = { }
for k, v in pairs(data) do
_tbl_0[k:upper()] = v
end
upper_keys = _tbl_0
end
assert.same(upper_keys.A, 1)
return assert.same(upper_keys.B, 2)
end)
it("should work with ipairs", function()
local items = {
"a",
"b",
"c"
}
local reversed
do
local _tbl_0 = { }
for i, v in ipairs(items) do
_tbl_0[i] = v
end
reversed = _tbl_0
end
assert.same(reversed[1], "a")
assert.same(reversed[2], "b")
return assert.same(reversed[3], "c")
end)
it("should filter array items", function()
local items = {
1,
2,
3,
4,
5
}
local evens
do
local _tbl_0 = { }
for i, v in ipairs(items) do
if v % 2 == 0 then
_tbl_0[i] = v
end
end
evens = _tbl_0
end
assert.same(evens[2], 2)
assert.same(evens[4], 4)
return assert.same(evens[1], nil)
end)
it("should work with numeric for loop", function()
local squares
do
local _tbl_0 = { }
for i = 1, 5 do
_tbl_0[i] = i * i
end
squares = _tbl_0
end
assert.same(squares[1], 1)
assert.same(squares[2], 4)
assert.same(squares[3], 9)
assert.same(squares[4], 16)
return assert.same(squares[5], 25)
end)
it("should support nested comprehensions", function()
local matrix = {
{
1,
2
},
{
3,
4
},
{
5,
6
}
}
local flat = { }
for _index_0 = 1, #matrix do
local row = matrix[_index_0]
for i, v in ipairs(row) do
flat[#flat + 1] = v
end
end
return assert.same(flat, {
1,
2,
3,
4,
5,
6
})
end)
it("should combine pairs and when", function()
local data = {
a = 1,
b = 2,
c = 3,
d = 4
}
local greater_than_two
do
local _tbl_0 = { }
for k, v in pairs(data) do
if v > 2 then
_tbl_0[k] = v
end
end
greater_than_two = _tbl_0
end
assert.same(greater_than_two.a, nil)
assert.same(greater_than_two.b, nil)
assert.same(greater_than_two.c, 3)
return assert.same(greater_than_two.d, 4)
end)
it("should work with string keys", function()
local obj = {
["key-with-dash"] = "value1",
["key_with_underscore"] = "value2"
}
local result
do
local _tbl_0 = { }
for k, v in pairs(obj) do
_tbl_0[k] = v
end
result = _tbl_0
end
assert.same(result["key-with-dash"], "value1")
return assert.same(result["key_with_underscore"], "value2")
end)
it("should handle empty source", function()
local empty = { }
local result
do
local _tbl_0 = { }
for k, v in pairs(empty) do
_tbl_0[k] = v
end
result = _tbl_0
end
return assert.same(#result, 0)
end)
it("should work with computed keys", function()
local base = {
a = 1,
b = 2
}
local result
do
local _tbl_0 = { }
for k, v in pairs(base) do
_tbl_0[k .. "_suffix"] = v * 10
end
result = _tbl_0
end
assert.same(result.a_suffix, 10)
return assert.same(result.b_suffix, 20)
end)
it("should support nested table transformation", function()
local data = {
first = {
x = 1,
y = 2
},
second = {
x = 3,
y = 4
}
}
local transformed
do
local _tbl_0 = { }
for k, v in pairs(data) do
_tbl_0[k] = v.x + v.y
end
transformed = _tbl_0
end
assert.same(transformed.first, 3)
return assert.same(transformed.second, 7)
end)
it("should filter with multiple conditions", function()
local numbers = {
a = 1,
b = 2,
c = 3,
d = 4,
e = 5
}
local result
do
local _tbl_0 = { }
for k, v in pairs(numbers) do
if v > 1 and v < 5 then
_tbl_0[k] = v
end
end
result = _tbl_0
end
assert.same(result.a, nil)
assert.same(result.b, 2)
assert.same(result.c, 3)
assert.same(result.d, 4)
return assert.same(result.e, nil)
end)
return it("should work with custom iterator", function()
local custom_iter
custom_iter = function()
local state = 0
return function()
state = state + 1
if state <= 3 then
return state, state * 10
else
return nil
end
end
end
local result
do
local _tbl_0 = { }
for k, v in custom_iter() do
_tbl_0[k] = v
end
result = _tbl_0
end
assert.same(result[1], 10)
assert.same(result[2], 20)
return assert.same(result[3], 30)
end)
end)
|
