Getting prepared for Smalltalk job? Do not panic, we will guide you how and what to answer in your interview. If you are preparing for Smalltalk job interview then go through Wisdomjobs interview questions and answers page. Smalltalk is a object oriented, reflective progamming language. Unlike C++ , Smalltalk is a pure object-oriented language with more rigorously enforced rules than C++, which permits some of the procedural constructs of the C language. Smalltalk programs are usually compiled to bytecode, which is then interpreted by a virtual machine into machine-native code. There are many openings for this job as this is much popular and used in every field. Please have a look at Smalltalk interview questions and answers page to win your interview.
Smalltalk is pure object oriented programming (OOPs), dynamically typed and reflective programming language.
Smalltalk is an improvement environment – class browsers, debugger, inspector and refactoring engine.
Everything is an object –variables, constants, activation records and classes.
Smalltalk was designed and created by Learning Research Group of Xerox PARC in 1972 and the Researcher Team –
All computation is performed by objects sending and receiving messages – 1+2*3
It is a pun on the usage of a text editor (and thus using the keyboard more, and the mouse less) to write programs for GNU Smalltalk, which sets it different from other Smalltalk.
It is quite stable. There are bugs for sure in the virtual machine, but unless you're unlucky you shouldn't be affected. This is especially true for the stable branch, where only changes to improve stability are made; development releases are by their very nature less stable.
It is quite scalable, even though the garbage collector performs worse once you have more than 150-200 MB of live data. Very long strings also do not perform as well as they could. In general, object-orientation makes it easier to pick good data structures (such as streams).
It is quite fast. While GNU Smalltalk has an experimental just-in-time compiler, even the bytecode interpreter should be faster than most other scripting languages. However, GNU Smalltalk's base classes are written entirely in Smalltalk (unlike Python or Lua, for example). While this gives more flexibility to the programmer, programs that heavily use dictionaries may run slower than the equivalent programs in other languages.
GNU Smalltalk does not by default start a full-blown integrated development environment.
However, one is available and can be started with this command:
The latest git versions include a new IDE, called VisualGST,
that can be started with this command instead:
Smalltalk is an object-oriented programming language with a uniform programming model. Unlike many other languages, learning the Smalltalk programming language is easy because there are just a few concepts to grasp. Everything is an object in Smalltalk (including number, string, character, code blocks, and classes themselves), and everything is done through a single paradigm, that of sending messages from one object to another.
Many cool and revolutionary ideas were conceived from the Smalltalk community, including the very idea of window-based, graphical user interfaces. Smalltalk systems are open, as source code for every class is available and modifiable, including all the kernel classes; being free software, GNU Smalltalk extends this openness to the virtual machine, and complements it with the freedom to redistribute and publish your improvements.
First of all, it is free software. This means that you can play with it and understand how it works, break it and understand why it broke, fix it and enjoy having fixed it.
Compared to other Smalltalk implementations, GNU Smalltalk is very different in one aspect: it is pragmatically designed to be a tool rather than an environment. It complements other tools that you use in your daily work, without any pretense of completely replacing them. This also provides a smoother learning curve for people who know other scripting languages such as Python or Ruby.
A generator is a quick way to create a Stream. As you might have seen in an earlier question, streams are a powerful iteration tool that Smalltalk offers. A generator is a kind of pluggable stream, in that a user-supplied blocks defines which values are in a stream.
For example, here is an empty generator and two infinite generators:
Generator on: [ :gen | ]
Generator on: [ :gen | [ gen yield: 1 ] repeat ]
Generator inject: 1 into: [ :value | value + 1 ]
As a more concrete example, these lines process a file and create Person objects out of the file:
lines := file lines.
lines := lines select: [ :line | line ~ '^[A-Za-z]+ [0-9]+$' ].
fields := lines collect: [ :line | line subStrings ].
people := fields collect: [ :data |
Person name: data first age: data second asInteger ].
Let's see how to rewrite them to use a single Generator instead:
Generator on: [ :gen |
file linesDo: [ :line || data |
line ~ '^[A-Za-z]+ [0-9]+$' ifTrue: [
data := line subStrings.
gen yield: (Person name: data first age: data second asInteger) ] ] ].
As you can see, #select: becomes an if-statement, and the value from the final stream is yielded to the user of the generator.
Generators use continuations, but they shield the users from their complexity by presenting the same simple interface as streams.
VFS is GNU Smalltalk's Virtual FileSystem layer. VFS allows GNU Smalltalk programs to use archive files (.gz, .tar, .zip, etc.) and URLs transparently. The first implementation of VFS was inspired by the homonymous feature of the Midnight Commander, later incorporated in GNOME and now called GVFS.
VFS is a fundamental part of the implementation of .star packages.
Yes. Strings however are processed (e.g. read from a file) byte-per-byte. If you need per-character processing, you should load the Iconv package and convert strings to UnicodeString, using the #asUnicodeString method.
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