Zig Academy · Lesson

Unions That Hold One of Many Types

Store alternative shapes in one slot.

One Slot, Many Shapes

Sometimes a value could be an integer or a float, but only one at a time. A union stores exactly one of several possible types in a single slot.

You write union and list named fields, each with its own type. The value holds just one of those fields at any moment.

const Number = union { int: i64, float: f64 };