Modify deeply nested fields in case classes:
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Chain modifications:
Modify conditionally: Templates bundle for iwork – templates guru 5 0.
Modify several fields in one go:
Traverse options/lists/maps using .each:
.each can only be used inside a modify and 'unwraps' the container (currently supports Seqs, Options andMapss - only values are unwrapped for maps).You can add support for your own containers by providing an implicit QuicklensFunctor[C] with the appropriateC type parameter.
Traverse selected elements using .eachWhere:
Similarly to .each, you can use .eachWhere(p) where p is a predicate to modify only the elements which satisfythe condition. All other elements remain unchanged.
Modify specific elements in an option/sequence/map using .at:
Similarly to .each, .at modifies only the element at the given index/key. If there's no element at that index,an IndexOutOfBoundsException is thrown. In the above example, .at(2) selects an element in addresses: List[Address] and .at selects the lone possible element in street: Option[Street]. If street is None, a NoSuchElementException is thrown.
.at works for map keys as well:
Similarly to .each, .at modifies only the element with the given key. If there's no such element,an NoSuchElementException is thrown.
Modify specific elements in an option/sequence/map using .index:
Similarly to .at, .index modifies only the element at the given index/key. If there's no element at that index,no modification is made. In the above example, .index(2) selects an element in addresses: List[Address] and .index selects the lone possible element in street: Option[Street]. If street is None, no modification is made.
.index works for map keys as well:
Similarly to .at, .index modifies only the element with the given key. If there's no such element,no modification is made.
Modify specific elements in an option or map with a fallback using .atOrElse:
If props contains an entry for 'NumReports', then .atOrElse behaves the same as .at and the secondparameter is never evaluated. If there is no entry, then .atOrElse will make one using the second parameter and perform subsequent modifications on the newly instantiated default.
For Options, .atOrElse takes no arguments and acts similarly.
Traverse selected elements using .eachWhere:
Similarly to .each, you can use .eachWhere(p) where p is a predicate to modify only the elements which satisfythe condition. All other elements remain unchanged.
Modify specific elements in an option/sequence/map using .at:
Similarly to .each, .at modifies only the element at the given index/key. If there's no element at that index,an IndexOutOfBoundsException is thrown. In the above example, .at(2) selects an element in addresses: List[Address] and .at selects the lone possible element in street: Option[Street]. If street is None, a NoSuchElementException is thrown.
.at works for map keys as well:
Similarly to .each, .at modifies only the element with the given key. If there's no such element,an NoSuchElementException is thrown.
Modify specific elements in an option/sequence/map using .index:
Similarly to .at, .index modifies only the element at the given index/key. If there's no element at that index,no modification is made. In the above example, .index(2) selects an element in addresses: List[Address] and .index selects the lone possible element in street: Option[Street]. If street is None, no modification is made.
.index works for map keys as well:
Similarly to .at, .index modifies only the element with the given key. If there's no such element,no modification is made.
Modify specific elements in an option or map with a fallback using .atOrElse:
If props contains an entry for 'NumReports', then .atOrElse behaves the same as .at and the secondparameter is never evaluated. If there is no entry, then .atOrElse will make one using the second parameter and perform subsequent modifications on the newly instantiated default.
For Options, .atOrElse takes no arguments and acts similarly.
.atOrElse is currently not available for sequences because quicklens might need to insert many elements in the list in order to ensure that one is available at a particular position, and it's not clear that providing one default for all keys is the right behavior.
Modify Either fields using .eachLeft and .eachRight:
Modify fields when they are of a certain subtype:
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This is also known as a prism, see e.g. here.
Re-usable modifications (lenses):
Alternate syntax:
Composing lenses:
or, with alternate syntax:
Modify nested sealed hierarchies:
Note: this feature is experimental and might not work due to compilation order issues.See https://issues.scala-lang.org/browse/SI-7046 for more details.
Similar to lenses (1,2), but without the actual lens creation.
Read the blog for more info.
Available in Maven Central:
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Copyright (C) 2015-2019 SoftwareMill https://softwaremill.com.
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