Expressions
An expression in QEngine is a combination of constants, variables, operators, or functions that evaluates to produce a single result. Expressions are classified by the data type of the result they produce: boolean, number, decimal, text, and date-time. They are used wherever a computed or conditional value is needed in test scripts, such as in conditional statements, variable assignments, or function arguments.
Overview
An expression is a combination of values, constants, variables, operators, or functions, evaluated to produce another value. The resulting value is one of the various data types, such as number, text, boolean, etc.
Expressions are broadly classified by the data type of the result it evaluates. For example:
- Boolean expressions : Evaluate to either TRUE or FALSE
- Number expressions : Evaluate to integers
- Decimal expressions : Evaluate to decimal numbers
- Text expressions : Evaluate to text values
- Date-time expressions : Evaluate to date/time values
For example, 2+3; is an numerical expression that evaluates to 5. An example of a text expression is name = "john " + "smith";, which evaluates to "john smith", which is text data type.
The result of an expression is usually assigned to a variable, compared with another value, or simply used to execute various QEngine tasks.
Examples
- total = 1 + 2; // adding two arithmetic values
- name = "John" + "Smith"; // concatenating 2 string values
- if ( a == b ) // (a == b) is a boolean expression
- {
- <actions_to_be_executed>
- }
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