Created
July 26, 2019 03:12
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Lazy evaluation of function in Java
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| import java.math.BigDecimal; | |
| import java.util.function.Function; | |
| import static java.lang.String.format; | |
| class SampleLazyEvaluation { | |
| public static void main(String[] args) { | |
| Function<String, BigDecimal> asBigDecimal = BigDecimal::new; | |
| Function<Unit, BigDecimal> lazyAsBigDecimal = lazyApply(asBigDecimal, "3.00"); | |
| System.out.println(format("Eager: %s, Lazy: %s", | |
| asBigDecimal.apply("3.00"), lazyAsBigDecimal.apply(Unit.unit()))); | |
| } | |
| public static class Unit { | |
| private static final Unit unit = new Unit(); | |
| public static Unit unit(){ | |
| return unit; | |
| } | |
| } | |
| public static <A,B> Function<Unit, B> lazyApply(final Function<A, B> f, final A a){ | |
| return unit -> f.apply(a); | |
| } | |
| } |
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