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The following are all valid predicate expressions:
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c == 5 page:var("city") eq "Blackfoot" "Lindon" neq location:city() weather:curr_temp() < 90 location:city() + ", WA" eq city 5 * (weather:curr_temp() - 32) / 9 < 0 |
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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.
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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 |
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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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spicy = cheese like re/re#(nacho|pepperjack)/#; |
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Note that when the |
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There is an infix operator for testing membership, ><
. The >< operator tests the number or string in the right operand for membership in the map or array given by the left operand. For maps, membership extends to keys only.
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a = [5, 6, 7]; m = {"a" : 1, "b" : 2}; a >< 6 // returns true a >< 3 // returns false m >< "a" // returns true m >< "foo" // returns false |
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Compound predicate expressions are created using the operators &&
, ||
, and not
to express conjunction, disjunction, and negation, respectively. Conjunction has precedence over disjunction. Parentheses are used to group expressions for precedence.
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not a a && b a || b (a || b ) && not c |
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