JS+2 - Logical Operators • Tests two or more...

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CS 170  Javascript 2 Prof. Jim Appenzeller [email protected]
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Arithmetic Operators Symbols of basic arithmetic operations: Division / Multiplication * Addition + Subtraction –  we can group operations with parentheses  Multiply and divide are performed before add and subtract JavaScript does not have an operator for exponents We call “Binary operators” those that operate on two values Eg   a+b Unary operators operate on one value eg increment ++   and decrement – (two minuses) can be prefix (--a) or postfix (a++) 
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Assignment  Operators = += -= *= /= < Less than <= Less than or equal to > Greater than >= Greater than or equal to == Equal to != NOT equal to Comparison Operators
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Unformatted text preview: Logical Operators • Tests two or more relationships at the same time ▫ Teenagers are older than 12 and younger than 20 • Logical AND ▫ Symbol is && ▫ Result of (a && b) is true (a bool) if both a and b are true; else the result is false • Logical OR ▫ Symbol is || ▫ Result of (a || b ) is true if either a or b are true; else if BOTH are false, the result is false • Logical NOT ▫ Symbol is ! ▫ It is a unary operator; its result is the opposite logical value of the value it is applied to Comments in JS • Single Line comment: // your comment • Multi-line Comment: /* your comment */...
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