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a43bc554ee
Add new function, Xnor, designed to create a composed predicate representing the logical Exclusive NOR (XNOR) operation applied to a list of predicates. The XNOR operation is a logical operation that returns true only if all operands have the same boolean value
76 lines
2.6 KiB
Go
76 lines
2.6 KiB
Go
package function
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// And returns a composed predicate that represents the logical AND of a list of predicates.
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// It evaluates to true only if all predicates evaluate to true for the given value.
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func And[T any](predicates ...func(T) bool) func(T) bool {
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if len(predicates) < 2 {
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panic("programming error: predicates count must be at least 2")
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}
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return func(value T) bool {
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for _, predicate := range predicates {
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if !predicate(value) {
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return false // Short-circuit on the first false predicate
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}
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}
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return true // True if all predicates are true
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}
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}
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// Negate returns a predicate that represents the logical negation of this predicate.
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func Negate[T any](predicate func(T) bool) func(T) bool {
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return func(value T) bool {
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return !predicate(value)
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}
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}
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// Or returns a composed predicate that represents the logical OR of a list of predicates.
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// It evaluates to true if at least one of the predicates evaluates to true for the given value.
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func Or[T any](predicates ...func(T) bool) func(T) bool {
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if len(predicates) < 2 {
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panic("programming error: predicates count must be at least 2")
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}
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return func(value T) bool {
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for _, predicate := range predicates {
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if predicate(value) {
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return true // Short-circuit on the first true predicate
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}
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}
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return false // False if all predicates are false
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}
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}
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// Nor returns a composed predicate that represents the logical NOR of a list of predicates.
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// It evaluates to true only if all predicates evaluate to false for the given value.
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func Nor[T any](predicates ...func(T) bool) func(T) bool {
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if len(predicates) < 2 {
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panic("programming error: predicates count must be at least 2")
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}
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return func(value T) bool {
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for _, predicate := range predicates {
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if predicate(value) {
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return false // If any predicate evaluates to true, the NOR result is false
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}
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}
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return true // Only returns true if all predicates evaluate to false
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}
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}
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// Xnor returns a composed predicate that represents the logical XNOR of a list of predicates.
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// It evaluates to true only if all predicates evaluate to true or false for the given value.
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func Xnor[T any](predicates ...func(T) bool) func(T) bool {
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if len(predicates) < 2 {
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panic("programming error: predicates count must be at least 2")
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}
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return func(value T) bool {
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trueCount := 0
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for _, predicate := range predicates {
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if predicate(value) {
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trueCount++
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}
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}
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// XNOR is true if either all predicates are true or all are false
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// This is the same as saying trueCount is 0 (all false) or trueCount is len(predicates) (all true)
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return trueCount == 0 || trueCount == len(predicates)
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}
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}
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