Introductory Beginning

Basic English for Computing: Teacher's Book by Eric Glendinning

By Eric Glendinning

This topic-centered path covers key computing features whereas constructing the 4 skills.
The Teacher's Book offers complete aid for the non-specialist, and a solution key.

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JavaScript statements can be grouped together into blocks by using curly brackets. You will often see this in functions, and control flow statements. 1. while (x < 10) { 2. x++; 3. } JavaScript does not have block scope. Instead, the scope is the same as the function or script that precedes it. This is very important because they do not introduce a scope, so if you use the same variable name thinking that they have different scopes, then your script will have bugs. While standalone block statements are allowed, they do not do what you would normally expect, and thus, you might just write your statements without them.

This is the best way to control your code for now exceptions. 1. 2. 3. 4. 5. 6. 7. try { throw "myException" } catch (e) { logMyErrors(e) // generates an exception // statements to handle any exceptions // pass exception object to error handler } The finally block is the last part, which is in charge of executing statements after the try and catch, but before the rest of the statements of your program or script. The finally block will be executed even if there is no catch block. Basically, the finally is used to make your program or script provide useful information as to why it failed, instead of just abruptly crashing.

4. 5. 6. 7. //valid variable names: var _myVar = "Yes"; var $myVar = "Yes"; var my$Var = "Yes"; var myVar$ = "Yes"; var myVar77 = "Yes"; var $myVAR_ = "Yes"; Variables are like labels that identify containers with information, and as the name implies, they are able to vary. Variables are used to store information and make it easy to reference them by giving them a name. The name given to the variable will remain the same, but you can always change the value or information that it contains. This means you could have a variable named “price” used to store the current price of an item; you could either assign a “null” value, which will create an empty variable, or assign any number value.

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