Mastering JavaScript

JavaScript Primer
JavaScript supports the standard variations of types:
• Number
• String
• Boolean
• Symbol (new in ECMAScript 6)
• Object:
• Null
° ° Function
° ° Array
° ° Date
° ° RegExp
• Undefined
Number
The Number type can represent both 32-bit integer and 64-bit floating point values.
For example, the following line of code declares a variable to hold an integer value,
which is defined by the literal 555:
var aNumber = 555;
To define a floating point value, you need to include a decimal point and one digit
after the decimal point:
var aFloat = 555.0;
Essentially, there's no such thing as an integer in JavaScript. JavaScript uses a 64-bit
floating point representation, which is the same as Java's double.
Hence, you would see something as follows:
EN-VedA:~$ node
> 0.1+0.2
0.30000000000000004
> (0.1+0.2)===0.3
false
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