CHAPTER 4 DECISIONS & LOOPS

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Presentation transcript:

CHAPTER 4 DECISIONS & LOOPS

A script can do different things depending on what values it has been passed.

MAKING DECISIONS

Is test score greater than 50? Y Message: Try again… Message: You passed!

if

if (score > 50)

Is test score greater than 50?

if (score > 50) { document.write(‘You passed!’); }

Is test score greater than 50? Y

Is test score greater than 50? Y Message: You passed!

if (score > 50) { document.write(‘You passed!’); } else { }

Is test score greater than 50? Y Message: You passed!

if (score > 50) { document.write(‘You passed!’); } else { document.write(‘Try again…’); }

Is test score greater than 50? Y Message: Try again… Message: You passed!

Is test score greater than 50? Y Message: Try again… Message: You passed! CONTINUE SCRIPT…

COMPARISON OPERATORS

= = IS EQUAL TO

= = IS EQUAL TO ! = IS NOT EQUAL TO

= = IS EQUAL TO ! = IS NOT EQUAL TO = = = STRICT EQUAL TO

= = IS EQUAL TO ! = = = = ! = = IS NOT EQUAL TO STRICT EQUAL TO STRICT NOT EQUAL TO

> GREATER THAN

> GREATER THAN < LESS THAN

> GREATER THAN < > = LESS THAN > = GREATER THAN OR EQUAL TO

> GREATER THAN < > = < = LESS THAN > = GREATER THAN OR EQUAL TO < = LESS THAN OR EQUAL TO

LOGICAL OPERATORS

if (score > 75)&&(score < 95) { document.write(‘Very good!’); }

if (score > 75)&&(score < 95) { document.write(‘Very good!’); }

& & LOGICAL AND

& & LOGICAL AND | | LOGICAL OR

& & LOGICAL AND | | LOGICAL OR ! LOGICAL NOT

SWITCH STATEMENTS

switch

switch (level) { }

switch (level) { case ‘One’: title = ‘Level 1’; break; }

switch (level) { case ‘One’: title = ‘Level 1’; break; case ‘Two’: title = ‘Level 2’; break; }

switch (level) { case ‘One’: title = ‘Level 1’; break; case ‘Two’: title = ‘Level 2’; break; case ‘Three’: title = ‘Level 3’; break; }

switch (level) { case ‘One’: title = ‘Level 1’; break; case ‘Two’: title = ‘Level 2’; break; case ‘Three’: title = ‘Level 3’; break; default: title = ‘Test’; break; }

LOOPS

for (var i = 0; i < 3; i++) { document.write(i); }

for (var i = 0; i < 3; i++) { document.write(i); } KEYWORD

for (var i = 0; i < 3; i++) { document.write(i); } CONDITION (COUNTER)

for (var i = 0; i < 3; i++) { document.write(i); } The variable i is declared and set a value of 0 INITIALIZATION

for (var i = 0; i < 3; i++) { document.write(i); } Every time the loop is run, the condition is checked to see if i is less than 3 CONDITION

for (var i = 0; i < 3; i++) { document.write(i); } If i is less than 3, the code block is run

for (var i = 0; i < 3; i++) { document.write(i); } The variable i can be used inside the loop (here it is used to write its value to the page)

for (var i = 0; i < 3; i++) { document.write(i); } When the code inside the curly braces has been executed, the variable i is incremented by 1 UPDATE

ANATOMY OF A LOOP

2 1 i = 0 i = 1 i = 2 i = 3

i = 0

Is i less than 3? i = 0

Yes, i is less than 3 i = 0

Write i to the page i = 0

Add 1 to i i = 0 i = 1

i = 0 i = 1

i = 0 i = 1 Is i less than 3?

i = 0 i = 1 Yes, i is less than 3

i = 0 i = 1 Write i to the page 1

i = 0 i = 1 Add 1 to i i = 2 1

1 i = 0 i = 1 i = 2

1 i = 0 i = 1 i = 2 Is i less than 3?

1 i = 0 i = 1 i = 2 Yes, i is less than 3

1 i = 0 i = 1 i = 2 Write i to the page 2

1 i = 0 i = 1 i = 2 Add 1 to i i = 3 2

2 1 i = 0 i = 1 i = 2 i = 3

2 1 i = 0 i = 1 i = 2 i = 3 Is i less than 3?

2 1 i = 0 i = 1 i = 2 i = 3 No, i is not less than 3

2 1 i = 0 i = 1 i = 2 i = 3 End loop