21 lines
461 B
V
21 lines
461 B
V
struct Counter {
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mut:
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val int
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}
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// if this is called more than once, the test'll fail
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fn (mut c Counter) new_arr(msg string) []int {
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if c.val > 0 { panic(msg) }
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c.val++
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return [1, 3, 2]
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}
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fn test_array_eval_count() {
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// `new_arr()` should only be evaluated once, not on every iteration
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mut a1 := Counter{}
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assert a1.new_arr('map() failed').map(it * 2) == [2, 6, 4]
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mut a2 := Counter{}
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assert a2.new_arr('filter() failed').filter(it < 3) == [1, 2]
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}
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