Update conditional statement article. #112

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		# Conditional operators: if, '?'

	Sometimes we need to perform different actions basing on a condition.
	Sometimes we need to perform different actions based on a condition.

	There's an `if` operator for that and also the "question mark" operator: `"?"` for conditional evaluation.
	There is `if` statement for that and also the conditional (ternary) operator for conditional evaluation which we will be referring as "question mark" operator: `"?"` for simplicity.

		[cut]

	## The "if" operator
	## The "if" statement

	The "if" operator gets a condition, evaluates it and -- if the result is `true` -- executes the code.
	The "if" statement gets a condition, evaluates it and -- if the result is `true` -- executes the code.

		For example:

Expand All		@@ -22,7 +22,7 @@ if (year == 2015) alert( 'You are right!' );

		In the example above, the condition is a simple equality check: `year == 2015`, but it can be much more complex.

	If there's more than one command to execute -- we can use a code block in figure brackets:
	If there is more than one command to execute -- we can use a code block in figure brackets:

		```js
		if (year == 2015) {
Expand All		@@ -31,11 +31,11 @@ if (year == 2015) {
		}
		```

	It is recommended to use figure brackets every time with `if`, even if there's only one command. That improves readability.
	It is recommended to use figure brackets every time with `if`, even if there is only one command. That improves readability.

		## Boolean conversion

	The `if (...)` operator evaluates the expression in parentheses and converts it to the boolean type.
	The `if (...)` statement evaluates the expression in parentheses and converts it to the boolean type.

		Let's recall the conversion rules from the chapter <info:type-conversions>:

Expand Down Expand Up		@@ -70,7 +70,7 @@ if (cond) {

		## The "else" clause

	The `if` operator may contain an optional "else" block. It executes when the condition is wrong.
	The `if` statement may contain an optional "else" block. It executes when the condition is wrong.

		For example:
		```js run
Expand All		@@ -85,7 +85,7 @@ if (year == 2015) {

		## Several conditions: "else if"

	Sometimes we'd like to test several variants of a condition. There's an `else if` clause for that.
	Sometimes we'd like to test several variants of a condition. There is an `else if` clause for that.

		For example:

Expand Down Expand Up		@@ -220,7 +220,7 @@ We don't assign a result to a variable here, the idea is to execute different co

		The notation seem to be shorter than `if`, that appeals to some programmers. But it is less readable.

	Here's the same with `if` for comparison:
	Here is the same with `if` for comparison:

		```js run no-beautify
		let company = prompt('Which company created JavaScript?', '');
Expand All		@@ -236,4 +236,4 @@ if (company == 'Netscape') {

		Our eyes scan the code vertically. The constructs which span several lines are easier to understand than a long horizontal instruction set.

	The idea of a question mark `'?'` is to return one or another value depending on the condition. Please use it for exactly that. There's `if` to execute different branches of the code.
	The idea of a question mark `'?'` is to return one or another value depending on the condition. Please use it for exactly that. There is `if` to execute different branches of the code.

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