 | ActionScript: The Definitive Guide |  |
Special string operators -- concatenation (&), equality (eq ), inequality (ne), and comparison (lt, gt, le, ge) -- were required when using string data in Flash 4. In Flash 5 and later, the special string operators are deprecated (i.e., supported but obsolete). Use ==, !=, <, >, <=, and >= for string comparisons, unless exporting to Flash 4 .swf format, in which case you must use the old operators (eq , ne, lt, gt, le, ge). Use + for string concatenation, unless exporting to Flash 4 format, in which case you should use add instead of & (because & is the bitwise AND operator in Flash 5 and later).
For more details and a list of Flash 4 versus Flash 5 string-operation equivalencies, see Section 4.6, "Working with Strings" and Table 4-2 in Chapter 4, "Primitive Datatypes".
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| 5.5. The Comparison Operators |  | 5.7. The Logical Operators |
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