https://github.com/planetis-m/looper

For loop macros for Nim
https://github.com/planetis-m/looper

Last synced: 3 months ago
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For loop macros for Nim

• Host: GitHub
• URL: https://github.com/planetis-m/looper
• Owner: planetis-m
• License: other
• Created: 2019-10-08T17:25:31.000Z (about 5 years ago)
• Default Branch: master
• Last Pushed: 2020-11-28T17:43:33.000Z (almost 4 years ago)
• Last Synced: 2024-07-29T00:46:28.660Z (3 months ago)
• Language: Nim
• Size: 9.77 KB
• Stars: 7
• Watchers: 1
• Forks: 2
• Open Issues: 0
• Metadata Files:
  • Readme: readme.md
  • License: copying.txt

Awesome Lists containing this project

• awesome-nim - looper - For loop macros for Nim. (Language Features / Iteration)

README

        

# Looper — for loop macros for Nim

## About

This nimble package contains ``for`` loop macros. This is an expiremental Nim future.

They work like inline iterators - only called from ``for`` loops.

### The `zip` macro

```nim

import looper

let

   a = [1, 3, 5, 7]

   b = @[0, 2, 4, 6, 8]

   c = @["one", "two", "three", "four", "five"]

# It supports variadic arguments of different types,

# each container type must support indexing

for (x, y, z) in zip(a, b, c):

   echo x, " ", y, " ", z

# Also written as:

for x, y, z in zip(a, b, c):

   echo x, " ", y, " ", z

# This is supported too:

for w in zip(a, b, c):

   echo w

```

### The `enumerate` macro

```nim

import looper

let

   a = [1, 3, 5, 7]

for (i, x) in enumerate(a.iter):

   echo i, " ", x

# Also written as:

for i, x in enumerate(a.iter):

   echo i, " ", x

```

### Known quirks

- Nested tuple unpacking ``for (i, (x, y)) in enumerate(iterable)`` is invalid syntax

  you have to write ``for i, (x, y) in enumerate(iterable)`` instead.

- The enumerate macros doesn't support tuples: ``for w in enumerate(iterable)`` this is because of

  the way it is implemented.

### License

This library is distributed under the MIT license. For more information see `copying.txt`.