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Apex programming language is object based programming language; Apex programming code is strongly typed and runs natively on the server.
| Data_type of Apex | Valid_values |
| ‘string’ | 0(zero) or more unicode_characters. |
| ‘boolean’ | 1(true) or 0(false) |
| ‘date’ | date only; no_time information is included. |
| ‘datetime’ | date and time value |
| ‘time’ | time only; no date information is included |
| ‘integer’ | 32 bit, whole number (-2 to 2). |
| ‘long’ | 64 bit, whole number(-263 to 263-1). |
| ‘decimal’ | signed number with whole (m, integer) and fractional components(n), expressed as m.n total length of number, including sign and decimal point, cannot exceed 19 characters. |
| ‘double’ | 64 bit signed number with a decimal point. |
| ‘blob’ | Binary_data |
| ‘id’ | id is variation of the string type to store the unique identifiers. id values are restricted to 18 characters. values are checked at compile and runtime, and a stringexception is thrown if they do not conform. |
| object | object is the generic type. variables defined as object are essentially type less and can recieve any value. typeless code is vulnerable to runtime errors beause it is invisible to the compiler's type checking functionality. |
| OPERATORS | OPERANDS | PRECEDENCE | DESCRIPTION |
| = | any compatible types | 9 | assignment |
| +, - | date, datetime, time | 4 | add or subtract days on date, datetime, milliseconds on time, argument must be integer or long |
| + | string | N/A | string concatenation |
| +, -, *, / | integer, long, double, decimal | 4 | numeric add, subtract, multiply, divide |
| ! | boolean | 2 | logical negation |
| - | integer, long, double, decimal | 2 | arithmetic negation |
| ++, -- | integer, long, double, decimal | 1 | unary increment, decrement |
| &, |, ^ | integer, long, boolean | 10 | bitwise AND, OR, XOR |
| <<, >>, >>> | integer, long | 10 | Signed shift_left, signed shift_right, unsigned shift_right |
| ==, <, >, <=, >=, != | -any compatible types | 5(<, >, <=, >=), 6(==, !=) | not case sensitive, locale sensitive comparisons; equality, less_than, greater_than, less_than or equal_to, greater_than or equal_to, not equal to |
| &&, | | | -boolean | 7(&&), 8(||) | -AND, OR, with short circuiting behavior (second argument is not evaluated if first argument is sufficient to determine result) |
| ===, !== | -map, list, set, enum, object | N/A | -exact equality, exact inequality |
| ( ) | -any | 1 | -group an expression and increase its precedence |
| ? : | -boolean | N/A | -shortcut for if/then/else expression |
| Name | syntax | Description |
| Do while loop | do { code_block} while (condiltion); | executes code block as long as boolean condition is true. evaluates condition after running code block, executing the code block at leas once. |
| while loop | while (condition) { code_block; } | executes code block as long as boolean condition is true. evaluates condition before running code block, so code block might not be executed at all |
| traditional for loop | dor (init; exit condition; increment) {code_clock;} | executes init statement once. loop on the following steps: exit loop if boolean executes code block, executes increment statement. |
| list/set iteration for loop | for (var : list/set) {code_block} | for every element of the list or set, assigns var to the current element and executes the code block. cannot modify the collection while iterating. |
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