An example of writing `take` in Java.

README.md

This is my example code response to Why Functional Programming in Java is Dangerous which i (somewhat harshly) commented about.

Take.java

package org.nicerobot;

import java.util.Iterator;

interface Applyable<T> {
  public T apply (Integer n);
}

public class Take {

  public static void main (final String[] args) {
    new Take().test();
  }

  public void test () {
    final Applyable<String> square = new Applyable<String>() {
      @Override
      public String apply (final Integer value) {
        return String.format("%d\t%d", value, value * value);
      }
    };

    for (final String s : this.take(25, square)) {
      System.out.println(s);
    }
  }

  private <T> Iterable<T> take (final Integer i, final Applyable<T> f) {
    return new Iterable<T>() {
      @Override
      public Iterator<T> iterator () {
        return new Iterator<T>() {
          private Integer n = 0;

          @Override
          public boolean hasNext () {
            return this.n + 1 < i.intValue();
          }

          @Override
          public T next () {
            return f.apply(++this.n);
          }

          @Override
          public void remove () {}
        };
      }
    };
  }
}