Lambda Expression

A function with a default return is lambda expression in ReoScript.

Define Lambda

var plus = (a, b) => a + b;

It is same as

function plus(a, b) {
  return a + b;
}

Using Lambda

var result = plus(1, 2);

result is

3

Array Extension with Lambda support

Here is a function named 'where' which find matched element over array by given predicate lambda expression.

Array.prototype.where = predicate => {
  var result = [];
    
  for(var element in this)
    if( predicate(element) )
      result.push(element);

  return result;
};

Now use 'where' to find number less than 10:

var arr = [1, 2, 5, 7, 8, 10, 12, 15, 17, 18, 19];
var result = arr.where( n => n > 10 );

The result is:

[12, 15, 17, 18, 19]