javascript initialize array object code example

Example 1: javascript loop object

let obj = {
  key1: "value1",
  key2: "value2",
  key3: "value3"
}

Object.keys(obj).forEach(key => {
    console.log(key, obj[key]);
});
// key1 value1
// key2 value2
// key3 value3

// using for in - same output as above
for (let key in obj) {
  let value = obj[key];
  console.log(key, value);
}

Example 2: java initialize object array

import java.util.stream.Stream;

class Example {
  
  public static void main(String[] args) {
    int len = 5;  // For example.
    
    // Use Stream to initialize array.
    Foo[] arr = Stream.generate(() -> new Foo(1))  // Lambda can be anything that returns Foo. 
                      .limit(len)
                      .toArray(Foo[]::new);
  }
  
  // For example.
  class Foo {
    public int bar;

    public Foo(int bar) {
      this.bar = bar;
    }
  }
}