I stumbled upon this variation:
let a: [number | string];
After searching online and consulting the Typescript documentation, I couldn't find any reference to this specific syntax. It's interesting because it combines both number and string in a union type, but it doesn't fit the definition of a tuple or an array. Can anyone shed some light on what this syntax represents? Could someone provide a straightforward explanation of how to declare and populate it with values?
This is a one-element tuple that can hold either a numeric value or a string
In my opinion, this particular structure can be best described as a unique type of collection that is capable of holding just one element, limited to either a number or a string.
Some may categorize it as a tuple, but personally I believe tuples are intended for storing multiple values, not just a single one. Both interpretations are valid in their own right.
On another note: Whenever I encounter unfamiliar syntax, I find it beneficial to experiment with them in the typescript sandbox and analyze the resulting javascript code: https://www.typescriptlang.org/play/
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