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JavaScript operators
This document discusses JavaScript operators. It covers unary, binary, and ternary operators. It describes each operator's associativity, number of operands, and operand and result types. Common operators covered include arithmetic, comparison, logical, bitwise, assignment, and more.
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JavaScript operators
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- 4. ⁄⁄⁄ ● Preferred type,string or number ○ if no preferred type, default number except for instances of Date CONVERSION TO PRIMITIVE
- 5. ⁄⁄⁄ ● plus (+ ) ● comparison ( <, <=, >, >=, ==, != ) ○ in- and equality only if both aren't a object PLUS AND COMPARISON TO PRIMITIVE
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- 7. ⁄⁄⁄ ● Organized byoperator precedence ● Punctuation characters ○ like: +, =, % ● Keywords ○ like: delete, void, typeof ● Associativity ○ LTR ( Left-to-right ) and RTL ( Right-to-left ) ● Number of operands ○ 1 - 3 ● Types ○ input type(s) → result type INTRODUCTION OPERATORS
- 8. ⁄⁄⁄ INCREMENT OPERATORS ● Pre- orpost-increment Operator Associativity Number of operands Types ++ Right-to-left 1 lvalue → number
- 9. ⁄⁄⁄ DECREMENT OPERATORS ● Pre- orpost-decrement Operator Associativity Number of operands Types -- Right-to-left 1 lvalue → number
- 10. ⁄⁄⁄ UNARY MINUS OPERATORS ● Changesthe sign of the result Operator Associativity Number of operands Types - Right-to-left 1 number → number
- 11. ⁄⁄⁄ UNARY PLUS OPERATORS ● Convertsto a number ● See type conversion last presentation http://www.slideshare.net/victorandresperez/java-script-introduction-34306832/26 Operator Associativity Number of operands Types + Right-to-left 1 number → number
- 12. ⁄⁄⁄ BITWISE NOT OPERATORS ● Reversingall bits ● -( x + 1) Operator Associativity Number of operands Types ~ Right-to-left 1 int → int
- 13. ⁄⁄⁄ DELETE OPERATORS ● Removes aproperty ○ returns true if the property was successful deleted Operator Associativity Number of operands Types delete Right-to-left 1 lvalue→ boolean
- 14. ⁄⁄⁄ TYPEOF OPERATORS ● Determine typeof operand ○ http://www.slideshare.net/victorandresperez/java-script-introduction-34306832/25 Operator Associativity Number of operands Types typeof Right-to-left 1 any → string
- 15. ⁄⁄⁄ VOID OPERATORS ● Evaluates itsoperand and then returns undefined Operator Associativity Number of operands Types void Right-to-left 1 any → undefined
- 16. ⁄⁄⁄ MULTIPLY, DIVIDE &REMAINDER OPERATORS ● Multiplication ● Division ● Modulo ( remainder after division ) Operator Associativity Number of operands Types * Left-to-right 2 number, number → number / Left-to-right 2 number, number → number % Left-to-right 2 number, number → number
- 17. ⁄⁄⁄ ADD & SUBTRACT OPERATORS ●Addition ( + ) ● Subtraction ( - ) Operator Associativity Number of operands Types + Left-to-right 2 number, number → number - Left-to-right 2 number, number → number
- 18. ⁄⁄⁄ CONCATENATE STRINGS OPERATORS ● Willconcatenate both strings to a new string Operator Associativity Number of operands Types + Left-to-right 2 string,string→ string
- 19. ⁄⁄⁄ SHIFT LEFT OPERATORS ● movesall bits in its first operand to the left by the number of places in the second operand ● between 0 and 31 ● x * 2^y Operator Associativity Number of operands Types << Left-to-right 2 int, int→ int
- 20. ⁄⁄⁄ SHIFT RIGHT WITHSIGN OPERATORS ● moves all bits in its first operand to the right by the number of places specified in the second operand ● between 0 and 31 Operator Associativity Number of operands Types >> Left-to-right 2 int, int→ int
- 21. ⁄⁄⁄ SHIFT RIGHT WITHZERO FILL OPERATORS ● Same as >> operator, except that the bits shifted in on the left are always zero Operator Associativity Number of operands Types >>> Left-to-right 2 int, int→ int
- 22. ⁄⁄⁄ COMPARE NUMBERS OPERATORS ● Lessthan ( < ), greater than ( > ), less than or equal ( <= ), greater than or equal ( >= ) Operator Associativity Number of operands Types < Left-to-right 2 number, number→ boolean > Left-to-right 2 number, number→ boolean <= Left-to-right 2 number, number→ boolean >= Left-to-right 2 number, number→ boolean
- 23. ⁄⁄⁄ COMPARE STRINGS OPERATORS ● Lessthan ( < ), greater than ( > ), less than or equal ( <= ), greater than or equal ( >= ) ● 16-bit integers ● Capital ASCII is less than lowercase ASCII Operator Associativity Number of operands Types < Left-to-right 2 string, string → boolean > Left-to-right 2 string, string → boolean <= Left-to-right 2 string, string → boolean >= Left-to-right 2 string, string → boolean
- 24. ⁄⁄⁄ INSTANCEOF OPERATORS ● Checks ofthe left operand is an instanceof the right operand Operator Associativity Number of operands Types instanceof Left-to-right 2 object,function→ boolean
- 25. ⁄⁄⁄ IN OPERATORS ● Checks ofthe left-side value is a property in the right-side value Operator Associativity Number of operands Types in Left-to-right 2 string,object→ boolean
- 26. ⁄⁄⁄ EQUALITY OPERATORS ● Checks ofboth operands are equal ● 2 objects are check by references ● Type conversion if types are not equal Operator Associativity Number of operands Types == Left-to-right 2 any,any→ boolean
- 27. ⁄⁄⁄ INEQUALITY OPERATORS ● Checks ofboth operands are not equal ● 2 objects are check by references ● Type conversion if types are not equal Operator Associativity Number of operands Types != Left-to-right 2 any,any→ boolean
- 28. ⁄⁄⁄ STRICT EQUALITY OPERATORS ● Checksof both operands are equal ● 2 objects are check by references Operator Associativity Number of operands Types === Left-to-right 2 any,any→ boolean
- 29. ⁄⁄⁄ STRICT INEQUALITY OPERATORS ● Checksof both operands are not equal ● 2 objects are check by references Operator Associativity Number of operands Types !== Left-to-right 2 any,any→ boolean
- 30. ⁄⁄⁄ BITWISE AND OPERATORS ● Performsthe AND operation on each pair of bits ○ yields 1 if both bits are 1, else yields 0 Operator Associativity Number of operands Types & Left-to-right 2 int,int→ int
- 31. ⁄⁄⁄ BITWISE XOR OPERATORS ● Performsthe XOR operation on each pair of bits ○ yields 1 if both bits not equal, else yields 0 Operator Associativity Number of operands Types ^ Left-to-right 2 int,int→ int
- 32. ⁄⁄⁄ BITWISE OR OPERATORS ● Performsthe OR operation on each pair of bits ○ yields 0 if both bits are 0, else yields 1 Operator Associativity Number of operands Types | Left-to-right 2 int,int→ int
- 33. ⁄⁄⁄ LOGICAL AND OPERATORS ● Returnsa “truthy” or “falsy” value ● Returns the left operand if the left operand is “falsy”, else return right operand ● “falsy” values are: false, null, undefined, 0, -0, NaN and empty string ( "" ) Operator Associativity Number of operands Types && Left-to-right 2 any,any→ any
- 34. ⁄⁄⁄ LOGICAL OR OPERATORS ● Returnsa “truthy” or “falsy” value ● Returns the left operand if the left operand is “truthy”, else return right operand ● “falsy” values are: false, null, undefined, 0, -0, NaN and empty string ( "" ) Operator Associativity Number of operands Types || Left-to-right 2 any,any→ any
- 35. ⁄⁄⁄ CONDITIONAL OPERATOR OPERATORS ● Theonly ternary operator ( three operands ) ● if first operand is “truly”, then the second operand is evaluated, else the third operand Operator Associativity Number of operands Types ?: Right-to-left 3 boolean,any,any→ any
- 36. ⁄⁄⁄ ASSIGNMENT OPERATORS ● Assign toa variable or property Operator Associativity Number of operands Types = Right-to-left 2 lvalue,any→ any
- 37. ⁄⁄⁄ OPERATE AND ASSIGN OPERATORS ●a operate= b is the same as a = a operate b Operators Associativity Number of operands Types *=, /=, %=, +=, -=, &=, ^=, |=, <<=, >>=, >>>= Right-to-left 2 lvalue,any→ any Operator Example Equivalent += -= *= /= %= <<= >>= >>>= &= |= ^= a += b a -= b a *= b a /= b a %= b a <<= b a >>= b a >>>= b a &= b a |= b a ^= b a = a + b a = a - b a = a * b a = a / b a = a % b a = a << b a = a >> b a = a >>> b a = a & b a = a | b a = a ^ b
- 38. ⁄⁄⁄ COMMA OPERATORS ● Evaluates theleft operand, then the right operand and then returns the value of the right operand. Operators Associativity Number of operands Types , Left-to-right 2 any,any→ any
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