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In Typescript, is there an equivalent to default?
If not, can its behaviour be implemented somehow?
example:
let myNumber = default<Number>(); // 0
let myInstance = default<MyClass>(); // null
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js can dynamically load an external C or C++ DLL file at runtime and utilize its API to perform some operations written inside it from a JavaScript program. This is basically how a Native Addon works in Node. js.
The JavaScript in operator is used to check if a specified property exists in an object or in its inherited properties (in other words, its prototype chain). The in operator returns true if the specified property exists. Anatomy of a simple JavaScript object.
No, there is no such thing in TypeScript:
If the strictNullChecks flag is set, each type (including user-defined) would need its own default instance, which is not practical
If it is unset, the default value for everything is undefined so there would be no point having a special default operator
If you need this behaviour you will have to define default functions yourself for each type that you need - and even then, you will not be able to use them generically because generic type information is not preserved at runtime
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