C#•15mo ago

❔ Is there a built-in way to map (transform) a tuple?

For example, I'd like to do this (hypothetical code):

bool foo = (val: 1.0, truthiness: true, name: "hello").Map((bar) => { bar.val > 0 && bar.name == "Bob" || bar.truthiness });

bool foo = (val: 1.0, truthiness: true, name: "hello").Map((bar) => { bar.val > 0 && bar.name == "Bob" || bar.truthiness });

instead of that

var bar = (val: 1.0, truthiness: true, name: "hello");
bool foo = bar.val > 0 && bar.name == "Bob" || bar.truthiness;

var bar = (val: 1.0, truthiness: true, name: "hello");
bool foo = bar.val > 0 && bar.name == "Bob" || bar.truthiness;

The reasoning is that it's cumbersome to have to introduce variable names for intermediate computations involving tuples. Being able to transform them directly makes it possible to avoid that.

7 Replies

Thinker•15mo ago

If I'm understanding correctly, there is no built-in way to do it, but you could have a general-purpose Map extension.

public static TResult Map<TSource, TResult>(this TSource source, Func<TSource, TResult> map) => map(source);

public static TResult Map<TSource, TResult>(this TSource source, Func<TSource, TResult> map) => map(source);

MODiX•15mo ago

Thinker

REPL Result: Success

static TResult Map<TSource, TResult>(this TSource source, Func<TSource, TResult> map) => map(source);

bool foo = (val: 1.0, truthiness: true, name: "hello").Map((bar) => bar.val > 0 && bar.name == "Bob" || bar.truthiness);
foo

static TResult Map<TSource, TResult>(this TSource source, Func<TSource, TResult> map) => map(source);

bool foo = (val: 1.0, truthiness: true, name: "hello").Map((bar) => bar.val > 0 && bar.name == "Bob" || bar.truthiness);
foo

Result: bool

True

True

Compile: 690.131ms | Execution: 118.999ms | React with ❌ to remove this embed.

Thinker•15mo ago

I assume what you're looking for is more like F#'s built-in |> operator

__dil__OP•15mo ago

I don't know F#, so I can't really comment on that. By "built-in" I merely meant "something part of the standard library".

Thinker•15mo ago

Yeah no, there isn't

__dil__OP•15mo ago

it seems like your solution works just fine though (although it's not built-in) thanks!

Accord•15mo ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ Is there a built-in way to map (transform) a tuple?