JS+Conditionals - else if<Boolean expression...

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CS 170: JS If statements Prof. Jim Appenzeller [email protected]
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Syntax: confirm ("a question you need to ask the  user"); the Confirm Function
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Conditional Statements the  'if'  statement Syntax: if(<Boolean expression>) { <then-statement1>; <then-statement2>; <then-statement3>; } <Boolean expression> an expression with an outcome of either true or false. <then-statement>  (one or zero) or more JavaScript statements. depends on how we use brackets Always use the curly braces,  { and }  for your if- statements.
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If-Else Statements Allows execution of a set of statements if a  condition is true and another set of statements if  condition is false if (<Boolean expression>) { <then-statement1>; <then-statement2>; <then-statement3>; } else { <else-statement>; }
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“if – else if – else” Basic Structure: if (<Boolean expression 1>) { <then-statements 1>;
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Unformatted text preview: } else if (<Boolean expression 2>) { <then-statements 2>; } else if (<Boolean expression 3>) { <then-statements 3a>; <then-statements3b> } else if (<Boolean expression 4>) { <then-statements 4>; } else { < then-statements 5a>; // Default statements <then-statements5b>; } If a particular Boolean expression evaluates to true <then-statement> performed. Exit out of the if-else structure without checking for other matches. false <else-statement> skipped. Move to next Boolean expression check if it matches. Using Logical Operators with Conditionals • we can use the ‘&&’ (and) and ‘||’ (or) operators to join multiple expressions for the boolean test. • Remember: “a && b” means BOTH a and b have to be true “a || b” means EITHER one can be true...
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This note was uploaded on 12/14/2011 for the course COMP APPS 170 taught by Professor Gayatreeganu during the Fall '08 term at Rutgers.

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JS+Conditionals - else if<Boolean expression...

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