bathos
/ consequence-of-constructor-kind-derived.js
Created
April 16, 2021 18:18
demonstration of the consequence of whether [[ConstructorKind]] is "base" or "derived"
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| // CLASS SYNTAX //////////////////////////////////////////////////////////////// | |
| class AFoo {} | |
| class ABar extends AFoo {} | |
| // FUNCTION SYNTAX NEAR-EQUIV ////////////////////////////////////////////////// | |
| function BFoo() { | |
| if (!new.target) { | |
| throw new TypeError('Illegal constructor'); |
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| // This is useful for a few things: | |
| // | |
| // 1. Checking what dictionary options are supported by some platform API. | |
| // 2. Debugging mysterious cases where an object you pass as input to another | |
| // API doesn’t seem to get treated the way you’re expecting. | |
| // 3. When designing another Proxy’s handler implementation, verifying that you | |
| // are accounting for everything correctly and that the intended abstraction | |
| // isn’t leaking in quirky ways. | |
| // | |
| // ex: |
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