https://github.com/markmandel/while-let

Repeatedly executes body while test expression is true, evaluating the body with binding-form bound to the value of test.
https://github.com/markmandel/while-let

Last synced: about 1 year ago
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Repeatedly executes body while test expression is true, evaluating the body with binding-form bound to the value of test.

• Host: GitHub
• URL: https://github.com/markmandel/while-let
• Owner: markmandel
• License: epl-1.0
• Created: 2014-01-08T02:48:07.000Z (over 12 years ago)
• Default Branch: master
• Last Pushed: 2021-05-22T14:29:29.000Z (about 5 years ago)
• Last Synced: 2025-04-10T06:32:34.107Z (about 1 year ago)
• Language: Clojure
• Size: 169 KB
• Stars: 20
• Watchers: 2
• Forks: 1
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# while-let

Repeatedly executes body while test expression is true, evaluating the body with binding-form bound to the value of test.

I've found this particularly useful with [core.async](https://github.com/clojure/core.async), where you want to loop

until a channel is closed (and it returns nil).

## Installation

In your project.clj add:

![Clojars Version](https://clojars.org/while-let/latest-version.svg)

## Usage

```

(while-let bindings & body)

```

### Simple example

Pop each item off the front of a vector and print it out.

```clojure

(let [data (atom [1 2 3 4 5])]

          (while-let [item (first @data)]

                     (println "item: " item)

                     (swap! data rest)))

```

### Core.async example:

Take from a channel until it gets closed (a closed channel will return `nil`), or the channel returns `false`

```clojure

(go (while-let [data (