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POJavaScript Code Contract Libraries?
 

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  1. POJavaScript Code Contract Libraries?
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    <p>I am just starting up a new web application and I want to implement some form of contract'esque style validation in my JavaScript. I did some quick googling, and came across <a href="http://kinsey.no/blog/index.php/2010/02/03/jscontract-code-contracts-for-javascript/" rel="noreferrer">JsContact</a> but the syntax isn't quite what I had in mind. Is anyone aware of other libraries?</p> <p>I am thinking I want the syntax to be something like</p> <pre><code>String.prototype.padLeft = function(c, width) { Verify.value(c).isRequired().isNotNull().isChar(); Verify.value(width).isRequired().isNotNull().isNumber().greaterThan(0); ... Verify.value(result).isNotNull(); return result; }; </code></pre> <p>Although it won't take long to put together my own library that has the syntax/methods I want, if someone else has already done the work and it is close enough, it will save me some time. Thanks in advance.</p> <p><strong>UPDATE</strong></p> <p>I won't have time to work on this until this afternoon, so I will give it a few more hours to see if anyone has any recommendations. If not, I will post whatever I create up somewhere as an answer below for other people to reference if they desire.</p> <p>I have also given a little more thought to the API that would make sense, and I am currently thinking something like (contrived examples):</p> <pre><code> function searchUser(firstName, middleInit, lastName) { Verify.value(firstName).isString().matching(/\w+/); // Must have value Verify.value(middleInit).whenNotNull().isChar(); // May be null, but not undefined Verify.value(lastName).isString().withMinimumLengthOf(2); // Must have value ... } function syncTime(serverTime, now) { Verify.value(serverTime).isDate(); // Must have value. Verify.value(now).whenDefined().isDate(); // May be undefined, but not null. } </code></pre> <p>My current thought is that tolerating NULL or UNDEFINED values is atypical (at least for me?), as such, rather than explicitly specifying that a value .isNotNull() you would actually disable the rule for .whenDefined() or .whenNotNull() as shown above. I may make .whenNotNull() not error on UNDEFINED, but I see NULL vs. UNDEFINED as an important distinction; we'll see... all other methods will be pretty typical... thoughts? comments?</p>
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    1. USChris Baxter
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