Arithmetic and Comparison Operators
on Saturday, 18th of July, 2020
Dart supports all the operators you'd expect from a modern programming language.
Arithmetic
| Operator | Meaning |
|---|---|
| + | Add |
| - | Subtract |
| -expr | Unary minus, also known as negation (reverse the sign of the expression) |
| * | Multiply |
| / | Divide |
| ~/ | Divide, returning an integer result |
| % | Get the remainder of an integer division (modulo) |
| ++var | var = var + 1 (expression value is var + 1) |
| var++ | var = var + 1 (expression value is var) |
| --var | var = var – 1 (expression value is var – 1) |
| var-- | var = var – 1 (expression value is var) |
example use:
assert(2 + 3 == 5);
assert(2 - 3 == -1);
assert(2 * 3 == 6);
assert(5 / 2 == 2.5); // Result is a double
assert(5 ~/ 2 == 2); // Result is an int
assert(5 % 2 == 1); // Remainder
assert('5/2 = ${5 ~/ 2} r ${5 % 2}' == '5/2 = 2 r 1');
var a, b;
a = 0;
b = ++a; // Increment a before b gets its value.
assert(a == b); // 1 == 1
a = 0;
b = a++; // Increment a AFTER b gets its value.
assert(a != b); // 1 != 0
a = 0;
b = --a; // Decrement a before b gets its value.
assert(a == b); // -1 == -1
a = 0;
b = a--; // Decrement a AFTER b gets its value.
assert(a != b); // -1 != 0Comparison
| Operator | Meaning |
|---|---|
| == | Equal |
| != | Not equal |
| > | Greater than |
| < | Less than |
| >= | Greater than or equal to |
| <= | Less than or equal to |
example usage:
assert(2 == 2);
assert(2 != 3);
assert(3 > 2);
assert(2 < 3);
assert(3 >= 3);
assert(2 <= 3);- previous: const and final variables
- next: Lexical Scope
