Grammar

Suggested Reading:

• “JavaScript: The Good Parts” by Douglas Crockford
• JS for Cats http://jsforcats.com/
• Java Script in 10 minutes http://spencertipping.com/js-in-ten-minutes/js-in-ten-minutes.pdf

Documentation

The official documentation is ECMAScript 262 https://www.ecma-international.org/ecma-262/.

JavaScript Quirks

1. JavaScript has equality (==) and strict equality (===). The latter coerces the operands to the same time and then perform strict equality comparison.
2. Dot notation can be used to access object members, so can bracket notation.
3. Scope of where this keyword refers to; could be global object, method object, or even more specific.
4. Dynamic Typing

> typeof NaN
"number"

> 9999999999999999
10000000000000000

> 0.5+0.1==0.6
true

> 0.1+0.2==0.3
false

> Math.max()
-Infinity

> Math.min()
Infinity

> []+[]
""_

> []+{}
"[object Object]"

> {}+[]
0

>true+true+true===3
true

> true-true
0

> true==1
true

> true===1
false

> (!+[]+[]+![]).length
9

> 9+"1"
91

>91-"1"
90

> []==0
true