25 lines
694 B
Zig
25 lines
694 B
Zig
const expect = @import("std").testing.expect;
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// Blocks in Zig are expressions and can be given labels, which are used to yield values.
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// Here, we are using a label called `blk`.
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// Blocks yield values, meaning they can be used in place of a value.
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// The value of an empty block `{}` is a value of the type `void`.
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test "labelled blocks" {
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const count = blk: {
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var sum: u32 = 0;
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var i: u32 = 0;
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while (i < 10) : (i += 1) sum += i;
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break :blk sum;
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};
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try expect(count == 45);
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try expect(@TypeOf(count) == u32);
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}
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// This can be seen as being equivalent to C's `i++`.
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// blk: {
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// const tmp = i;
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// i += 1;
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// break :blk tmp;
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// }
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