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update description of 050_no_value for clarity

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Robert Fry 2026-03-09 23:16:30 +00:00
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exercises/050_no_value.zig
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@ -14,8 +14,8 @@
//
// "undefined" should not be thought of as a value, but as a way
// of telling the compiler that you are not assigning a value
// _yet_. Any type may be set to undefined, but attempting
// to read or use that value is _always_ a mistake.
// _yet_. Any variable may be set to undefined, but attempting to
// read its value before assigning one _always_ a mistake.
//
// * null
//
@ -24,7 +24,7 @@
// The "null" primitive value _is_ a value that means "no value".
// This is typically used with optional types as with the ?u8
// shown above. When foo equals null, that's not a value of type
// u8. It means there is _no value_ of type u8 in foo at all!
// u8. It means you have assigned foo to have _no value_!
//
// * error
//
@ -32,10 +32,9 @@
//
// Errors are _very_ similar to nulls. They _are_ a value, but
// they usually indicate that the "real value" you were looking
// for does not exist. Instead, you have an error. The example
// error union type of MyError!u8 means that foo either holds
// a u8 value OR an error. There is _no value_ of type u8 in foo
// when it's set to an error!
// for does not exist. Instead of "no value", you have an error.
// The example error union type of MyError!u8 means that foo
// either holds a u8 value OR a MyError error.
//
// * void
//
@ -55,7 +54,7 @@
// * undefined - there is no value YET, this cannot be read YET
// * null - there is an explicit value of "no value"
// * errors - there is no value because something went wrong
// * void - there will NEVER be a value stored here
// * void - there will NEVER be a value here
//
// Please use the correct "no value" for each ??? to make this program
// print out a cursed quote from the Necronomicon. ...If you dare.