TIL Bloom Filter

May 20th, 2018 #TIL, Data Structures & Algorithms, JavaScript Kerry 1 min read

Refreshing some computer science concepts by taking Brian Holt’s course on FrontendMasters.com. The first part lesson was on Bloom Filter’s, which sounded complicated and scary. The concept ended up being easy to grasp and he presents a great example of a practical application. The devil is obviously in the details but knowing a tool exists and the reasons to use it is always a step…

TIL: -0

Mar 21st, 2018 #TIL, JavaScript Kerry 1 min read

Prior to ES6, the only way to check if a number is -0 is to divide any number by it and check if it equals -Infinity. With ES6, you can use Object.is(value, -0).  

TIL: NaN !== NaN

Mar 21st, 2018 #TIL, JavaScript Kerry 1 min read

NaN does not follow the identity property. NaN is the result of trying to convert a non-number to a number. NaN with any other operation is going to produce NaN. Number.isNaN does not convert prior to checking if a value is NaN. window/global.isNaN does. In ES6, you can check for NaN equality using Object.is().

TIL I Can Control .history

Sep 1st, 2017 #TIL, JavaScript, ReactJS Kerry 2 min read

Lots of turmoil and heated debate in the US surrounding history and who we immortalize in marble and bronze. Fortunately this blog is neither Politico or Fox News and you don’t have to hear me weigh in. The history that I’m talking about is **drumroll** browser history. If you’re wondering why it took so long to discover this, I mean, it’s only been out since Chrome version…

TIL Arrow Function

Feb 9th, 2017 #TIL, JavaScript Kerry 2 min read

TIL that the arrow function introduced in ES6/2015 is NOT just short-hand for a normal function declaration. It uses lexical this scoping rather than the dynamic. Kyle Simpson argues in his excellent series You Don’t Know JavaScript that this was created in part because people misunderstand how this works and how to utilize bind. Take the following example:

The above function’s setTimeout call-site is the global scope. This…

TIL Hoisting

Feb 9th, 2017 #TIL, JavaScript Kerry 1 min read

Today’s nugget of information is brought to you by McDonald’s 6-piece Chicken McNuggets. Hoisting in JavaScript is when the compiler performs all declarations at the beginning of a scope. TIL that the following single line of code is interpreted by the compiler as two lines:

This is why functions created by variable assignments cannot be used prior to assignment unlike regular function declarations, i.e.

Inaugural TIL

Feb 7th, 2017 #TIL, JavaScript Kerry 1 min read

TIL stands for Today I Learned. Starting today, I’ll be posting daily about one thing I learned related to web/game development and engineering. My way of trying to aspire to freeCodeCamp’s #100DaysOfCode challenge. To kick things off, today I learned that in Javascript, if not in strict mode, making an assignment to an undeclared variable, no matter how nested the scope, will result in the variable being…

Trie Harder

Feb 4th, 2017 Data Structures & Algorithms, JavaScript Kerry 7 min read

Whether your resolution was to go to the gym three times a week or write a blog post once per week, they usually all end in the same: Broken. It’s not that I haven’t been coding or continuing to learn. I’ve done a lot of coding at work these days using Phaser and solving puzzles over at CodinGame and FreeCodeCamp. Writing doesn’t quite ignite my soul the…