groovy

Add "implies" operator for boolean expressions

Details

  • Type: New Feature New Feature
  • Status: Open Open
  • Priority: Minor Minor
  • Resolution: Unresolved
  • Affects Version/s: None
  • Fix Version/s: 4.0
  • Component/s: syntax
  • Labels:
    None
  • Number of attachments :
    0

Description

Consider supplying an "implies" operator, often denoted =>, for boolean expressions. Example:

if (itIsRaining => iAmUsingUmbrella) {
  println 'I am dry'
}

itIsRaining => iAmUsingUmbrella is equivalent with !itIsRaining | iAmUsingUmbrella but the "implies" version is in many cases intutively more suitable.

Issue Links

relates to

Improvement - An improvement or enhancement to an existing feature or task. GROOVY-2756 create new user overwritable operator methods for <,==,>,<=,=>,<==>

  • Major - Major loss of function.
  • Open - The issue is open and ready for the assignee to start work on it.

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blackdrag blackdrag added a comment -

an alternative for a=>b would be !a?:b. Still not as nice of course

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blackdrag blackdrag added a comment - an alternative for a=>b would be !a?:b. Still not as nice of course
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Paul King added a comment -

An implies method has been added for 1.8.3 and 1.9, e.g.:

itIsRaining.implies(iAmUsingUmbrella)

Given that the syntax for Java 8 Closures looks to be nearly finalised, we should be able to decide shortly whether a corresponding '=>' operator can also be added. Leaving the issue open for now until that decision is made.

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Paul King added a comment - An implies method has been added for 1.8.3 and 1.9, e.g.: itIsRaining.implies(iAmUsingUmbrella) Given that the syntax for Java 8 Closures looks to be nearly finalised, we should be able to decide shortly whether a corresponding '=>' operator can also be added. Leaving the issue open for now until that decision is made.

People

  • Assignee:
    Unassigned
    Reporter:
    Tord Alenljung
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Dates

  • Created:
    Updated: