While working on YourJS.com I was trying to figure out a quick way to use extract() to only convert some of the $_REQUEST values to variables in the symbol table. Then I realized I could use this: Using this will give you a new array with only the specified keys: Read more…
If you have been using JavaScript for a little bit you probably already know how to determine a variable’s class constructor, but just in case you are overthinking it here is a hint: variable.constructor. 🙂 Of course, many times I like to make functions that will spit my results for Read more…
Two years ago I wrote a post about how to pass arguments by name in JavaScript. Recently I have started to ramp a new project call YourJS and found a need to be able to read the names of the parameters of the given function. The following getParamNames() function takes Read more…
Now Available in YourJS Yesterday I was working with Math.cos, Math.sin and Math.tan and was thinking it would be nice to have the equivalent functions which accept the values in degrees instead of radians. For that reason I wrote the following definitions for Math.cosd, Math.sind and Math.tand: After executing the Read more…
One of the many cool things about Python is that you can often use builtin functions to either get a value from a dictionary (or an object with getattr) or default to a specified value. Unfortunately lists do not provide such a function. The simplest use case would be to Read more…
For a while many developers, including myself, suggested that Array.prototype.slice() be used to turn any array-like object into an array. Recently, I was alerted to a scenario in which this does not work as expected. Let’s take the following code for example: In most browsers, the above code would take Read more…
WARNING: Extending native prototypes is frowned upon by many JS engineers but can be helpful as long as the extensions are properly documented in the codebase. SCRIPTER’S DISCRETION IS ADVISED. 😆 Yesterday I added a post about String.prototype.before(...). As is explained within the post, this function can be used to Read more…
WARNING: Extending native prototypes is frowned upon by many JS engineers but can be helpful as long as the extensions are properly documented in the codebase. SCRIPTER’S DISCRETION IS ADVISED. 😆 Even though its NOT encouraged to extend native prototypes, at times you may find that doing so is pretty Read more…
Today, I had to figure out a way to parse an HTML string in Python in order to find all of the attribute values of attributes starting with a specific string. Since we already have BeautifulSoup installed, I started researching how to use a lambda function in conjunction with the Read more…
One of the great things about reading through Douglas Crockford’s site is that you get to learn about how certain things like prototypal inheritance was implemented prior to ECMAScript 5. Since then Object.create() made its way into JavaScript and has been available in most modern browsers for a while. If Read more…