Function differenceBy
Same as difference
except you can make it operatete on a publicly accessible member of ElementType!Range
auto auto differenceBy(string member, alias pred, Range, Rs...)
(
Range range,
Rs values
)
if (isRangeOverValidPredicate!(pred, Range));
Parameters
Name | Description |
---|---|
member | which member in ElementType!Range to find difference over |
pred | unary transformation or binary comparator |
range | the range to inspect |
values | ranges or single values to exclude |
See Also
Since
0.0.1
Example
struct A {
int value;
}
// with normal difference
assert([A(1), A(2), A(3)] .difference!((a, b) => a .value < b .value)([A(2), A(3)]) .equal([A(1)]));
// by using the By() version
assert([A(1), A(2), A(3)] .differenceBy!"value"([A(2), A(3)]) .equal([A(1)]));