Lambda

A lambda is an anonymous function value. It can be written as a single expression or as a block of statements, and it is invoked with run().

Simple Expressions

• simple expression: (x, y) ⇒ x+y

Block Statements

(x, y) => {
  let a = x + 1
  return a + y
}  // explicit return is required

the lambda parameter support object/array destructuring:

  // obj is a map/object type variable
  (obj) => obj.field1 + obj.field2
  // OR
  ({field1, field2}) => field1 + field2

run(lambda, arguments…​)

run lambda function with optional arguments

let printLabel = () => {  
  printf("hello world")  
}  
run(printLabel)

let inc = (i) => {  
  return i+1  
}  
printf("inc %d", run(inc, 2))