Your Coding Teacher

"Part of the inhumanity of the computer is that, once it is competently programmed and working smoothly, it is completely honest." - Isaac Asimov

In JavaScript, a function always returns a value. If the return value is not specified, then it returns undefined.

"Test doubles are objects that replace real dependencies to enable automated testing. They are the automated testing equivalent of movie stunt people: they take the place of the original since having the real one is expensive or impractical." Excellent analogy by @venkat_s

First, make it work. Then, make it fast.

"There are no significant bugs in our released software that any significant number of users want fixed." - Bill Gates

In theory, theory and practice are the same. In practice, they're not.

Inside every complex program is a simple program trying to get out

If the code and the comments disagree, they are both probably wrong

"Program testing can be a very effective way to show the presence of bugs, but is hopelessly inadequate for showing their absence." - Edsger Dijkstra

There are no "simple" bugs.

"The only constructive theory connecting neuroscience and psychology will arise from the study of software." - Alan J. Perlis

"Every program has (at least) two purposes: the one for which it was written, and another for which it wasn't." - Alan J. Perlis

I've yet to see a UML diagram in a professional environment.

Theory is when you know something, but it doesn't work Practice is when something works, but you don't know why Programmers combine theory and practice Nothing works and they don't know why

Check for if (-1 == x) instead of if (x == -1) to avoid bugs like if(x = -1)

"Computer science education cannot make anybody an expert programmer any more than studying brushes and pigment can make somebody an expert painter." - Eric Raymond

"No one hates software more than software developers." - Jeff Atwood

JavaScript's falsy values: - false - undefined - null - The number 0 - The number NaN - The empty string

Lines of code are only worth counting when you're deleting them

4 Random coding tips Write useful comments Stay humble Don't be afraid to ask for help Keep practicing