Order of Execution - Know the Code

Skip to episode playlist

Software has an order of execution. This is the program sequence, meaning the order in which your lines of code will be executed.

Your key takeaways are:

Software executes synchronously unless asynchronous features are used
Execution is in order until it encounters a control statement
Order of Precedence follows rules from math

Study Notes

There is an order or sequence to program execution.

Lines of Code Execution

Types of code execution:
- Synchronous – current line of code is executed before moving on to the next line
- Asynchronous – parallel processing
Languages execute code in sequential order
Branching and iterators can change the order

Code Execution

Language	Synchronous	Asynchronous Features
PHP	✓	✓
JavaScript	✓	✓
Ruby	✓	✓
Python	✓	✓
C	✓	✓
C#	✓	✓
Visual Basic	✓	✓

Order of Execution in Practice

	function _qa() {

	$('.qa-question').on('click', function() {
	var $ans = $(this).next('.qa-answer');

	if ( $(this).hasClass('opened') ) {
	_closeQA( $answer, $(this) );

	} else {
	_openQA( $answer, $(this) );
	}

	$ans = null;
	});
	}

view raw jquery.qa.js hosted with ❤ by GitHub

order of execution flowchart

Order of precedence

x = ( 520 + 71 )² x 10

You will grow in this profession when you incrementally and systematically stretch yourself....bit-by-bit.

Episodes

Total Lab Runtime: 02:17:55

1 Lab Introductionfree 06:21
2 User-Friendly Expression of Informationfree 22:42
3 Fundamentals of Syntaxfree 08:57
4 Decision Branching - if/then/elsefree 10:39
5 Decision Branching – switch/casefree 07:47
6 Basics of Iterationfree 14:14
7 Iteration in Practicefree 12:51
8 Order of Executionfree 10:55
9 Abstractionfree 11:45
10 Scoping – Who Can Communicate With Whomfree 31:44

Back to the lab's opening page.