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In Internet Explorer (IE) versions 5 through 9, a conditional comment is text formatted as a comment in HTML source code with special syntax that IE interprets as a conditional statement. A conditional comment specifies whether to include or exclude code based on the evaluation of a conditional expression and is generally used to support ...
For each case, either side of the equals sign "=" can be a simple string, a call to a parser function (including #expr to evaulate expressions), or a template call. If any cases are not associated with a value (i.e., no equals sign is used), the next specified value will be used.
JavaScript is case sensitive, so the uppercase characters "A" through "Z" are different from the lowercase characters "a" through "z". Starting with JavaScript 1.5, ISO 8859-1 or Unicode letters (or \uXXXX Unicode escape sequences) can be used in identifiers. [ 5 ]
For example: If stock=0 Then message= order new stock Else message= there is stock End If. In the example code above, the part represented by (Boolean condition) constitutes a conditional expression, having intrinsic value (e.g., it may be substituted by either of the values True or False) but having no intrinsic meaning
In such case it is always possible to use a function call, but this can be cumbersome and inelegant. For example, to pass conditionally different values as an argument for a constructor of a field or a base class, it is impossible to use a plain if-else statement; in this case we can use a conditional assignment expression, or a function call ...
The biconditional is true in two cases, where either both statements are true or both are false. The connective is biconditional (a statement of material equivalence), [2] and can be likened to the standard material conditional ("only if", equal to "if ... then") combined with its reverse ("if"); hence the name. The result is that the truth of ...
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Like the unstructured if, only one statement can be specified so in many cases a GOTO is needed to decide where flow of control should resume. Unfortunately, some implementations had a substantial overhead in both space and time (especially SUBSCRIPTRANGE), so many programmers tried to avoid using conditions. Common Syntax examples: