teishi | Tool for validating the input of functions | Security Framework library

teishi depends on dale.
Google Chrome 15 and above.
Mozilla Firefox 3 and above.
Safari 4 and above.
Internet Explorer 6 and above.
Microsoft Edge 14 and above.
Opera 10.6 and above.
Yandex 14.12 and above.
We wrap the entire file in a self-executing anonymous function. This practice is commonly named the javascript module pattern. The purpose of it is to wrap our code in a closure and hence avoid making the local variables we define here to be available outside of this module. A cursory test indicates that local variables exceed the scope of a script in the browser, but not in node.js. This means that this pattern is useful only on the browser. Since this file must run both in the browser and in node.js, we define a variable isNode to check where we are. The exports object only exists in node.js. We require dale. Note that, in the browser, dale will be loaded as a global variable. This is the most succinct form I found to export an object containing all the public members (functions and constants) of a javascript module. Note that, in the browser, we use the global variable teishi to export the library. To provide compatibility with older browsers, teishi provides its own indexOf polyfill for arrays. If the method is already defined (as it will be on any ES5 compatible browser), the polyfill won't be set. You can also override it by loading your own polyfill before loading teishi. The function takes two arguments, element and fromIndex. Within the function, this will refer to the array on which we're applying the operation. We iterate its elements using dale.stopNot, stopping when we find the first value that is not undefined. If fromIndex is present and it is larger than the index of the element currently being scanned, we ignore the element. If we found an element in the array that is equal to element, we return the index. If result is undefined, we could not find element, so we return -1. Otherwise, we return result which contains the index ofelement within the array. There's nothing else, so we close the function.