SWIFT CHAP 07 Flashcards
Looping Control Flow?
sequenced of looped statements wich are to be excuted until specfied condition is met
name the two types of control flow?
Looping Control
Condtional FLOW Control
for-in statement used for?
to iterate over s sequence of items contained in a number range or collection
CONDITIONAL FLOW CONTROL
WHETHER OR NOT CODE GETS EXCUTED
REPEAT WHILE LOOP
Evaluate expression while repeating code in the loop body.
if the condition is false on the first try for of a repeat while loop what happens to code?
does not get executed
breaking a loop ( {break} ) mean?
breaking out of code before the expression is met.
what does the {break} statement do when it exits a loop?
proceeds to the next line of code.
what does the if statement evaluate?
boolean true or false values.
{continue} statement?
causes all remaining statements in a loop body 2 b skipped and returned to top of loop.
after the {contiune} statement is executed what happens to the loop execution?
execution gets returned to the top of the loop.
if.. else statement?
like the else-if statement except that specify more than two conditions.
else.. if?
allows you to specify two expressions with true or false.
if the boolean expression in an (if) statement evaluates to true or false what happens?
if TRUE then code is executed.
If false code is skipped.
while loop … statement?
repeats a set of task, whilst a condition is met?
why do we use a (while loop)?
When we don’t know the number of times a loop will be needed to while meeting a condition.
when do we use (for…in) loops?
For when you know the number of loops needed.
(For in) loops don’t require a (const) name what can you reference instead?
you can replace a const-name with an underscore (_)
example:
var count = 0
for _ in 1…5
{count += 1}
decisions define what in code?
wich code gets executed, how man times it’s executed or if code gets bypassed while executing.
if a continue statement is triggered execution will be skipped to up to the top an of while loop
what happens to the body loop?
it will get executed until the criteria is met
a guard statement? {gaurd}
contains a boolean value that MUST BE TRUE in order to advance to the next line of code.
what clause does the (guard) statement must include?
must include an (else) clause to be executed. incase expression is false.
the (else) clause in a (guard) statement must include what?
a statement to exit the code flow
example: return, break, continue or throw statements
