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Last active June 29, 2019 16:18
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140byt.es -- jsonschema-like (nested) typechecking in few lines of js

140byt.es

A tweet-sized, fork-to-play, community-curated collection of JavaScript.

How to play

  1. Click the Fork button above to fork this gist.
  2. Modify all the files to according to the rules below.
  3. Save your entry and tweet it up!

Keep in mind that thanks to the awesome sensibilities of the GitHub team, gists are just repos. So feel free to clone yours and work locally for a more comfortable environment, and to allow commit messages.

Rules

All entries must exist in an index.js file, whose contents are

  1. an assignable, valid Javascript expression that
  2. contains no more than 140 bytes, and
  3. does not leak to the global scope.

All entries must also be licensed under the WTFPL or equally permissive license.

For more information

See the 140byt.es site for a showcase of entries (built itself using 140-byte entries!), and follow @140bytes on Twitter.

To learn about byte-saving hacks for your own code, or to contribute what you've learned, head to the wiki.

140byt.es is brought to you by Jed Schmidt, with help from Alex Kloss. It was inspired by work from Thomas Fuchs and Dustin Diaz.

Object.prototype.update = function(
a // (optional) data object
){
a = ! a ? this : a // if no data passed, assume we're tied to an object
var d = a.__proto__.schema = (data) => JSON.stringify(a,null,2)
.replace(/:[ ]?".*"/g,': "string"')
.replace(/:[ ]?[0-9]+/g,': "number"')
.replace(/:[ ]?(true|false)/g,': "boolean"')
var s = a.__proto__._schema
if( s && d.schema(a) != s ) throw "error:\n"+JSON.stringify(a,null,2)+"\ndoes not match schema:\n"+s
if( s ) return // all good, object has schema and validated ok
a.__proto__._schema = d.schema(a) // dump schema
a.__proto__._schema = d.schema(a) // again so it includes .schema as well
}
var data = {
a:"foo",
b:"bar",
c:true,
d:{ fkoo: 123, flop:[{yup:"123"}] }
}
data.update() // first time will remember schema
data.schema() // show schema
data.a = {}
data.update() // throws error + shows data/schema-conflict
function(){/* Your entry, a useful, unique, and valid JavaScript expression that packs as much functionality into 140 bytes as possible. */}
DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
Version 2, December 2004
Copyright (C) 2011 YOUR_NAME_HERE <YOUR_URL_HERE>
Everyone is permitted to copy and distribute verbatim or modified
copies of this license document, and changing it is allowed as long
as the name is changed.
DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
0. You just DO WHAT THE FUCK YOU WANT TO.
{
"name": "theNameOfYourLibWhichMustBeAValidCamelCasedJavaScriptIdentifier",
"description": "This should be a short description of your entry.",
"keywords": [
"five",
"descriptive",
"keywords",
"or",
"fewer"
]
}
<!DOCTYPE html>
<title>Foo</title>
<div>Expected value: <b>undefined</b></div>
<div>Actual value: <b id="ret"></b></div>
<script>
// write a small example that shows off the API for your example
// and tests it in one fell swoop.
var myFunction = function(){ /* the code here should be identical to the entry. */ }
document.getElementById( "ret" ).innerHTML = myFunction()
</script>
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