Javascript: The Good Parts
I’ve just finished to read Javascript: The Good Parts of Douglas Crockford. If you’re doing Javascript development you should read it if you haven’t.
This book is not a definitive guide to Javascript but will show you which part of the language to avoid if you want to eliminate a whole class of problems.
Here are some striking (at least for me) examples:
'' == '0' // false 0 == '' // true 0 == '0' // true
That’s because == tries to coerce the values if they are of different types.
return { status: true };
Will not return an object with a status field. It will return
undefined. Do you know why?
Another nice one is the parseInt() function.
parseInt('07') // returns 7 parseInt('08') // returns 0 parseInt('09') // returns 0
That’s because when the first character of the parsed string is a zero, it is evaluated in base 8. Seriously. In javascript. A high level language. Wow.
Don’t worry, the book is not only a compilation of the weird design
choices of Javascript. It will guide you through a world without global
variables and will show you how to use functions to create modules. You
will learn to master the prototypal object model and understand why the
new construct in Javascript is evil.
Highly recommended.
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