![]() ![]() This assures that all expressions are valid. When regular logical operators are used to combine logical expressions, InterSystems IRIS evaluates all of the specified expressions, even when the Boolean result is known before all of the expressions have been evaluated. There are two types of logical operators: regular logical operators ( & and !) and short-circuit logical operators ( & and ||). Like all InterSystems IRIS expressions, they are evaluated in strict left-to-right order. You can combine multiple Boolean logical expressions by using logical operators. For further details, refer to String-to-Number Conversion. InterSystems IRIS evaluates a non-numeric string as having a zero numeric value. Any expression that evaluates to a zero numeric value returns a Boolean 0 (FALSE) value. In a Boolean test, any expression that evaluates to a non-zero numeric value returns a Boolean 1 (TRUE) value. Logical expressions are most commonly used with: ![]() They evaluate expressions and result in a Boolean value: 1 (TRUE) or 0 (FALSE). Logical expressions use logical operators, numeric relational operators, and string relational operators. You can use explicit parentheses within an expression to force certain operations to be carried ahead of others. This is different from other languages in which certain operators have higher precedence than others. Operator precedence in ObjectScript is strictly left-to-right within an expression operations are performed in the order in which they appear. These are described in more detail in the following sections. ObjectScript includes the following operators: They are classified based on the types of operators they contain.Īn arithmetic expression contains arithmetic operators, gives a numeric interpretation to the operands, and produces a numeric result.Ī string expression contains string operators, gives a string interpretation to the operands, and produces a string result.Ī logical expression contains relational and logical operators, gives a logical interpretation to the operands, and produces a boolean result: TRUE (1) or FALSE (0). Such expressions produce a result that is the effect of the operator on the operand(s). Some operators take only one operand and are known as unary operators others take two operands and are known as binary operators.Īn operator and any of its operands taken together constitute an expression. When used together, an operator and its associated operands have the following form: Each operand consists of one or more expressions or expression atoms. Operators are symbolic characters that specify the action to be performed on their associated operands. Introduction to Operators and Expressions This chapter describes expressions and the various ObjectScript operators. Operators act on expressions, which are variables or other entities that ultimately evaluated to a value. InterSystems IRIS® data platform supports many different operators, which perform various actions, including mathematical actions, logical comparisons, and so on. Introduction to Operators and Expressions. ![]()
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