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