E - Programming language

E is an open source programming language created in 1997 by Mark S. Miller.

#559on PLDB

27Years Old

354Repos

E is an object-oriented programming language for secure distributed computing, created by Mark S. Miller, Dan Bornstein, and others at Electric Communities in 1997. E is mainly descended from the concurrent language Joule and from Original-E, a set of extensions to Java for secure distributed programming. Read more on Wikipedia...

Tags: programming language
There are at least 354 E repos on GitHub
Early development of E happened in Combex, Inc.
The Google BigQuery Public Dataset GitHub snapshot shows 291 users using E in 304 repos on GitHub
Explore E snippets on Rosetta Code
E on HOPL
erights.org was registered in 1998
See also: (5 related languages) GNU E, Joule, Java, Python, Pascal

Example from the web:

def factorial(n :int) :int {
  if (n == 1) {
    return 1
  } else if (n > 0) {
    return n * factorial(n-1)
  } else {
    throw("invalid argument to factorial: "+n)
  }
}

Example from the web:

# E snippet from
# http://wiki.erights.org/wiki/Walnut/Distributed_Computing/Promises
when (tempVow) -> {
    #...use tempVow
} catch prob {
    #.... report problem
} finally {
    #....log event
}

Example from hello-world:

println("Hello World")

Example from Wikipedia:

def makeMint(name) :any {
   def [sealer, unsealer] := makeBrandPair(name)
   def mint {
     to makePurse(var balance :(int >= 0)) :any {
       def decr(amount :(0..balance)) :void {
         balance -= amount
       }
       def purse {
         to getBalance() :int { return balance }
         to sprout() :any { return mint.makePurse(0) }
         to getDecr() :any { return sealer.seal(decr) }
         to deposit(amount :int, src) :void {
           unsealer.unseal(src.getDecr())(amount)
           balance += amount
         }
       }
       return purse
     }
   }
   return mint
 }

Language features

Feature	Supported	Example	Token
Strings	✓	"Hello world"	"
Print() Debugging	✓		println
Line Comments	✓	# A comment	#
Comments	✓
Semantic Indentation	X