Creation Number in Programming

JavaScript has only one type of numbers – 64-bit float point. It's the same as Java's double. Unlike most other programming languages, there is no separate integer type, so 1 and 1.0 are the same value.
In this chapter, we'll learn how to create numbers and perform operations on them (like additions and subtractions).

Creating a number is easy, it can be done just like for any other variable type using the var keyword.
Numbers can be created from a constant value:

// This is a float:
var a = 1.2;

// This is an integer:
var b = 10;

Or from the value of another variable:

var a = 2;
var b = a;

Comments

About Comment In Programming

Comments are statements that will not be executed by the interpreter, comments are used to mark annotations for other programmers or small descriptions of what your code does, thus making it easier for others to understand what your code does. In Javascript, comments can be written in 2 different ways: 1. Line starting with //: // This is a comment, it will be ignored by the interpreter var a = "this is a variable defined in a statement" ; 2. Section of code starting with /*and ending with */, this method is used for multi-line comments: /* This is a multi-line comment, it will be ignored by the interpreter */ var a = "this is a variable defined in a statement" ; source : gitbook "learn javascript"

About Type In Programming

Computers are sophisticated and can make use of more complex variables than just numbers. This is where variable types come in. Variables come in several types and different languages support different types. The most common types are: Float: a number, like 1.21323, 4, -33.5, 100004 or 0.123 Integer: a number like 1, 12, -33, 140 but not 1.233 Numbers String: a line of text like "boat", "elephant" or "damn, you are tall!" Boolean: either true or false, but nothing else Arrays: a collection of values like: 1,2,3,4,'I am bored now' Objects: a representation of a more complex object null: a variable that contains null contains no valid Number, String, Boolean, Array, or Object undefined: the undefined value is obtained when you use an object property that does not exist, or a variable that has been declared, but has no value assigned to it. JavaScript is a “loosely typed” language, which means that you don't have to explicitly declar...

About Equality in Programming

Programmers frequently need to determine the equality of variables in relation to other variables. This is done using an equality operator.+ The most basic equality operator is the == operator. This operator does everything it can to determine if two variables are equal, even if they are not of the same type. For example, assume: var foo = 42 ; var bar = 42 ; var baz = "42" ; var qux = "life" ; foo == bar will evaluate to true and baz == qux will evaluate to false, as one would expect. However, foo == baz will also evaluate to true despite foo and baz being different types. Behind the scenes the == equality operator attempts to force its operands to the same type before determining their equality. This is in contrast to the === equality operator. The === equality operator determines that two variables are equal if they are of the same type and have the same value. With the same assumptions as before, this means that foo === bar will still evaluate to t...

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