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76 lines
1.8 KiB
Plaintext
76 lines
1.8 KiB
Plaintext
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describe "comprehension", ->
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it "should double every number", ->
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input = {1,2,3,4,5,6}
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output_1 = [i * 2 for _, i in pairs input ]
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output_2 = [i * 2 for i in *input ]
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assert.same output_1, {2,4,6,8,10,12}
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it "should create a slice", ->
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input = {1,2,3,4,5,6}
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slice_1 = [i for i in *input[1,3]]
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slice_2 = [i for i in *input[,3]]
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slice_3 = [i for i in *input[3,]]
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slice_4 = [i for i in *input[,]]
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slice_5 = [i for i in *input[,,2]]
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slice_6 = [i for i in *input[2,,2]]
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assert.same slice_1, {1,2,3}
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assert.same slice_1, slice_2
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assert.same slice_3, {3,4,5,6}
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assert.same slice_4, input
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assert.same slice_5, {1,3,5}
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assert.same slice_6, {2,4,6}
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it "should be able to assign to self", ->
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input = {1,2,3,4}
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output = input
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output = [i * 2 for i in *output]
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assert.same input, {1,2,3,4}
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assert.same output, {2,4,6,8}
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output = input
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output = [i * 2 for _,i in ipairs input]
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assert.same input, {1,2,3,4}
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assert.same output, {2,4,6,8}
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describe "table comprehension", ->
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it "should copy table", ->
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input = { 1,2,3, hello: "world", thing: true }
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output = {k,v for k,v in pairs input }
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assert.is_true input != output
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assert.same input, output
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it "should support when", ->
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input = {
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color: "red"
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name: "fast"
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width: 123
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}
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output = { k,v for k,v in pairs input when k != "color" }
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assert.same output, { name: "fast", width: 123 }
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it "should do unpack", ->
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input = {4,9,16,25}
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output = {i, math.sqrt i for i in *input}
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assert.same output, { [4]: 2, [9]: 3, [16]: 4, [25]: 5 }
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it "should use multiple return values", ->
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input = { {"hello", "world"}, {"foo", "bar"} }
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output = { unpack tuple for tuple in *input }
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assert.same output, { foo: "bar", hello: "world" }
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