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As can be seen from the preceding examples, a number of built-in libraries provide predicates that can be used inside predicate expressions. The documentation for those libraries gives details about their operation.
Two special comparison operators are useful with the sort() operator: <=> and cmp. These operators return -1 if the first operand is less than the second, 0, if they're equal, and 1 if the first operand is greater than the second.The <=> operator is used with numbers and cmp is used with strings.
| Code Block | ||||
|---|---|---|---|---|
| ||||
x = 5;
y = 6;
x <=> y // returns -1
x <=> x // returns 0
y <=> x // returns 1
p = "aab";
q = "abb";
a cmp b // returns -1
a cmp a // returns 0
b cmp a // returns 1 |
Like
Like takes a regular expression as its second argument and returns true if it matches the string given as its first argument. Arguments to these operators can be any valid expression.
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