Mojo trait
Stringable
The Stringable
trait describes a type that can be converted to a String
.
Any type that conforms to Stringable
or
StringableRaising
works
with the built-in print()
and
str()
functions.
The Stringable
trait requires the type to define the __str__()
method.
For example:
@value
struct Foo(Stringable):
var s: String
fn __str__(self) -> String:
return self.s
@value
struct Foo(Stringable):
var s: String
fn __str__(self) -> String:
return self.s
Now you can pass an instance of Foo
to the str()
function to get back a
String
:
var foo = Foo("test")
print(str(foo) == "test")
var foo = Foo("test")
print(str(foo) == "test")
True
True
Note: If the __str__()
method might raise an error, use the
StringableRaising
trait, instead.
About the difference between __repr__()
and __str__()
:
The method __repr__
compute the compute the "official" string representation of an object
while __str__
computes the "informal" or nicely printable string representation of an object.
This method differs from __repr__()
in that there is no expectation that __str__()
return a valid Mojo expression: a more convenient or concise representation can be used.
Implemented traitsβ
AnyType
Methodsβ
__str__
β
__str__(self: T) -> String
Get the string representation of the type.
Returns:
The string representation of the type.
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