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Mojo unreleased changelog

This is a list of UNRELEASED changes for the Mojo language and tools.

When we cut a release, these notes move to changelog-released.md and that's what we publish.

[//]: # Here's the template to use when starting a new batch of notes: [//]: ## UNRELEASED [//]: ### ⭐️ New [//]: ### 🦋 Changed [//]: ### ❌ Removed [//]: ### 🛠️ Fixed

UNRELEASED

🔥 Legendary

⭐️ New

  • int() can now take a string and a specified base to parse an integer from a string: int("ff", 16) returns 255. Additionally, if a base of zero is specified, the string will be parsed as if it was an integer literal, with the base determined by whether the string contains the prefix "0x", "0o", or "0b". (PR #2273 by @artemiogr97, fixes #2274)

  • Mojo now allows types to opt in to use the abs() function by implementing the __abs__() method, defined by the new Absable:

    from math import sqrt

struct Point(Absable):
    var x: Float64
    var y: Float64

    fn __abs__(self) -> Self:
        return sqrt(self.x * self.x + self.y * self.y)

  • The abs() function has also moved from math to builtin, so you no longer need to do from math import abs.

  • Mojo now allows types to opt in to use the floor() and ceil() functions in the math module by implementing the __floor__() and __ceil__() methods (and so conforming to the new math.Floorable and math.Ceilable traits, respectively). For example:

      from math import Ceilable, Floorable, ceil, floor

  @value
  struct Complex(Ceilable, Floorable):
    var re: Float64
    var im: Float64

    fn __ceil__(self) -> Self:
        return Self(ceil(re), ceil(im))

    fn __floor__(self) -> Self:
        return Self(floor(re), floor(im))

🦋 Changed

❌ Removed

  • The method object.print() has been removed. Since now, object has the Stringable trait, you can use print(my_object) instead.

🛠️ Fixed