![]() For example, "123", "+123", ".123", "++0007", "-0".Ī partially numeric string is a string that begins with numeric symbols, followed by non-numeric characters. SET pies = "apple,banana,cherry" WRITE "Before: ", pies, ! // set the 3rd comma-delimited piece of pies to coconut SET $Piece ( pies, ",", 3 ) = "coconut" WRITE "After: ", pies Copy code to clipboard Copy link to this section String-to-Number ConversionĪ string can be numeric, partially numeric, or non-numeric.Ī numeric string consists entirely of numeric characters. Therefore, all functions are executed even though the first function returns 0 (FALSE) which automatically makes the result of the entire expression FALSE: In the following example, the IF test uses a regular logical operator (&). Therefore, IF x=7,y=4,z=2 is parsed as IF x=7 THEN IF y=4 THEN IF z=2, which is functionally identical to the short-circuit logical operators statement IF (x=7)&(y=4)&(z=2). In this case, InterSystems IRIS handles each listed argument like an independent command statement. Some commands allow you to specify a comma-separated list as an argument value. ![]() This allows you to avoid unnecessary time-consuming expression evaluations. Any logical expressions to the right of this expression are not evaluated. For example, if there are multiple AND tests, the first expression that returns 0 determines the overall Boolean result. When short-circuit logical operators are used to combine logical expressions, InterSystems IRIS evaluates only as many expressions as are needed to determine the Boolean result. 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. %New ( ) Copy code to clipboardĬopy link to this section Logical Expressions 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).Ĭopy link to this section Table of Operator Symbols 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. Copy link to this section 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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