or |
Type | operator |
Dictionary | LCS |
Library | LiveCode Script |
Syntax | <value1> or <value2>
|
Summary | Evaluates to true if either operand is true, false if both
operands are false.
|
Introduced | 1.0 |
OS | mac, windows, linux, ios, android |
Platforms | desktop, server, mobile |
Parameters | Name | Type | Description |
---|
value1 | | The value1 and value2 are true or false, or expressions that evaluate to
true or false.
|
value2 | | |
|
Example | ("a" > "b") or ("b" > "a")
(1 < 0) or (1 = 0)
wait until the controlKey is up or the commandKey is up
|
Related | Operator: not, and, bitOr, bitXor
Function: asin
Glossary: LiveCode, operand, value, operation, operator, logical, expression, evaluate, argument
Control Structure: function
|
Description | Use the or operator to combine two or more logical (true or false)
values.
If value1 is true or value2 is true, or if both value1 and
value2 are true, then the or operation evaluates to
true. Only if both value1 and value2 are false does the expression
value1 or value2 evaluate to false.
You can combine the logical operators and, or, and not in an
expression.
Note: LiveCode uses what is known as "short-circuit evaluation" for
logical operators. This means that value1 is
evaluated first. If value1 is true, the expression
value1 or value2 is true regardless of what value2 is (because the
expression evaluates to true as long as at least one of
the values is true). In this case, LiveCode does not
evaluate value2, since doing so is not necessary to determine the
value of value1 or value2. For example, evaluating the expression
asin(2) normally causes an execution error (because 2 is not a legal
argument for the arc sine function), but evaluating the
expression (1 = 1) or (asin(2) = 1) does not cause an error: since
(1 = 1) is always true, the whole statement is always true and
LiveCode never tries to evaluate the asin function.
|
Tags | math |