“Either throw Windows out of the computer or throw the computer out of the window.”
— #Richard_Stallman

“The principle of simplicity is the central theme of Ockham’s approach, so much so that this principle has come to be known as "Ockham’s Razor"; Ockham uses the razor to eliminate unnecessary hypotheses.”
— Sharon Kaye

“If you have built castles in the air, your work need not be lost; that is where they should be. Now put the foundations under them.”
— #Henry_David_Thoreau, advocating top-down design

“When walking in open territory, bother no one. If someone bothers you, ask him to stop. If he does not stop, destroy him.”
— #Anton_LaVey, Eleven Satanic Rules of the Earth

also very good advice for an MMORPG.

A strong pilot propels the idea.

Minimum object size is 16 bytes for modern 64-bit JDK since the object has 12-byte header, padded to a multiple of 8 bytes. In 32-bit JDK, the overhead is 8 bytes, padded to a multiple of 4 bytes.

References have a typical size of 4 bytes on 32-bit platforms and on 64-bits platforms with heap boundary less than 32Gb (-Xmx32G), and 8 bytes for this boundary above 32Gb.

#Java

read more

#characters
Arrows
⇐ ⇒ ⇔ ← →

#language #Pharo
Pharo

First appeared: 2008

Features:
• live programming
• purely object-oriented
• dynamically typed
• reflective
• inspired by #Smalltalk
• single inheritance between classes
• traits: groups of methods

"Pharo syntax fits on a single postcard."

Impromptu
- is an environment for live coding. It is built around #Scheme.

First appeared: 2005

Temporal recursion
Looping is performed by "temporal recursion", i.e. by having a function asynchronously schedule a future call to itself as its final action.

Though syntactically Scheme-like, it is semantically closer to #C, and is designed for real-time sound synthesis and other computationally heavy tasks. A programmer/performer can create and schedule code for future execution, as well as data events such as notes and graphics objects. It allows audio synthesis and video composition. It is compiled to machine language by #LLVM.

#toWatch

▶️ A Study in Keith

A live coding performance in Impromptu by Andrew Sorensen. The first two minutes (1:56) are silent, while the performer writes the program that will produce the introduction of the piece. From then on, he modifies the code on the fly to evolve the composition.

#Nile
The member operator (.)

Property get

"a.prop":
if a is an object
  if local variable prop exists
    => a.prop;
  else
    => call(a.type, 'get', prop, a)
else
  type = ...
  => call(type, 'get', prop, a)

Method call

"a.meth(args)":
if a is an object
  => call(a.type, meth, a, args)
else
  type = ...
  => call(type, meth, a, args)

Reformation versus mutation
• Reform (nurtural versus natural): to alter an instance
• Mutate (deep reformation) (mutable versus immutable): to alter the instance of the type of an instance, i.e. the seed

When a mutation method is applied to an object:
• Mutable: is changed and still occupies the same object address
• Immutable: is itself unchanged, rather returns a reconstructed version of itself where the mutation has taken place

What altering means for:
• Natural: cannot be altered, rather its type is altered
• Nurtural: the set of qualifications are modified

#Nile

Nature
What: what the Child PULLs from its Parent(s)
When: at the moment of conception

Nurture
What: what a Parent PUSHes to its Child(ren)
When: anytime

Soft inheritance
The idea that an organism can pass on characteristics that it has acquired during its lifetime to its offspring.

Hard inheritance
The idea that characteristics of an organism's offspring will not be affected by the actions that the parental organism performs during its lifetime.

Immutable objects
An immutable (unchangeable) object is an object whose state cannot be modified after it is created. This is in contrast to a mutable (changeable) object, which can be modified after it is created. Here is how and where they can be useful:

• thread safe
• more secure
• constants initialized both before and after the program is executed.
• when sharing the references of objects, it matters whether the state of an object can vary.
• if an object is known to be immutable, it can be copied simply by making a copy of a reference to it instead of copying the entire object.

#mathematics #Probability_theory
Bayes' theorem
It describes the probability of an event, based on prior knowledge of conditions that might be related to the event.
P(A, B) = P(B, A) * P(A) / P(B) where P(B) != 0

Conditional probability
P(X, Y) is the likelihood of event X occurring given that Y is true.

Marginal distribution
P(X) is the probabilities of observing X independently.

GUI 101

Generality encourages predictablity.

You are programmer material iff during problem solving your mind gravitates towards generalization. See inventor's paradox