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32 lines
871 B
TypeScript
32 lines
871 B
TypeScript
// The enum fences: everything that does NOT fold to a compile-time
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// constant is a pointed, named rejection — never a silently-wrong value.
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// (Constant-member enums themselves lower; see the 183x corpus programs.)
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// A computed member's initializer is a runtime expression Node evaluates
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// when the declaration executes — the declaration fences on the member.
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enum Computed {
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Ok = 1,
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Len = "abc".length,
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}
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// Reads of the computed member fence at the use site too.
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console.log(Computed.Len);
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enum E {
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A,
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B,
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}
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// The enum OBJECT as a value: no runtime representation exists.
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const grabbed = E;
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console.log(grabbed.A);
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// Reverse lookups through a runtime index.
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let i = 0;
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i += 1;
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console.log(E[i]);
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// A constant reverse index no member carries: Node answers undefined,
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// which the reverse mapping's `string` type cannot carry.
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console.log(E[42]);
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