C#•14mo ago

✅ Introduce variable in `while` condition

Is it possible to achieve something like this? (pseudo-C#)

while (Computation() val when val != otherVal)
  // You can use `val` here...

while (Computation() val when val != otherVal)
  // You can use `val` here...

The idea is that the loop should go until the result of some computation does not match some predicate, and to also keep the result of the computation around in the loop. If not, how would you achieve a similar pattern?

7 Replies

Thinker•14mo ago

while (Computation() is var val && val != otherVal)

while (Computation() is var val && val != otherVal)

bit of a strange syntax ik is var val is a pattern which just declares a variable returns true

__dil__OP•14mo ago

Oh that's great, thanks 😄

reflectronic•14mo ago

there is also the classic

T val;
while ((val = Computation()) != otherVal)

T val;
while ((val = Computation()) != otherVal)

Thinker•14mo ago

yikes

reflectronic•14mo ago

it, admittedly, is not a one-liner

__dil__OP•14mo ago

I really don't like variable declarations without initialization, but yeah that's a good pattern to know too

Accord•14mo 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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✅ Introduce variable in `while` condition