My presentation at the Programming Contact Day for the mixed audience of \PhD students from Mathematics and Chemical Technology departments. How can we develop software collaboratively?

1. Collaborative Software
Development
Alexander Serebrenik
a.serebrenik@tue.nl#WOCinTech Chat

2. Any fool can write code
that a computer can
understand.
Good programmers
write code that humans
can understand.
Martin Fowler
software developer, author,
speaker

4. How do developers
communicate?

5. How do developers
communicate?

6. 1 component =
1 concern
reuse, independent development
Separation of concerns

7. Design
Interface
(API)

8. https://youtu.be/
s7wmiS2mSXY?t=1m5s

9. User
Producer
API

10. Who can help me?
API API API API
What functionality
do I want?

11. #WOCinTech Chat

12. function bs(x){
var l = x.l;
for (var m = l-1; m>=0; m--) {
for (var q = 1; q<=m; q++) {
if (x[q-1]>x[q]) {
var s = x[q-1];
x[q-1] = x[q];
x[q] = s;
}
}
}
return x;
}

13. function bs(x){
var l = x.l;
for (var m = l-1; m>=0; m--) {
for (var q = 1; q<=m; q++) {
if (x[q-1]>x[q]) {
var s = x[q-1];
x[q-1] = x[q];
x[q] = s;
}
}
}
return x;
}
function bubbleSort(arr) {
var len = arr.length;
for (var i = len-1; i>=0; i--) {
for (var j = 1; j<=i; j++) {
if (arr[j-1]>arr[j]){
var temp = arr[j-1];
arr[j-1] = arr[j];
arr[j] = temp;
}
}
}
return arr;
}
Variable
names matter

14. Isn’t arr.sort() better?

15. Share!

18. Bugs, suggestions
of new features, …
Code
Code changes
suggested by
(external) contributors
Popularity
Derived
projects
Integrated code changes
suggested by (external)
contributors
Official milestones
Community License

19. language: python
python:
- "2.7"
- “3.4"
before_install:
- if [[ "$TRAVIS_PYTHON_VERSION" == "2.7" ]]; then
wget https://repo.continuum.io/miniconda/Miniconda2-latest-Linux-x86_64.sh -O miniconda.sh;
else
wget https://repo.continuum.io/miniconda/Miniconda3-latest-Linux-x86_64.sh -O miniconda.sh;
fi
<…>
install:
# Install recipy.
- python setup.py install
<…>
script:
- cd test/ && behave
- cd ..
# Run py.test with 'v' (verbose) to show test function names and
# 'rs' to show reasons for skipped tests
- py.test -v -rs integration_test
Travis-CI

20. Travis-CI in
Apache Thrift

26. Atze W. Hold

27. 1. Think about the APIs before the implementation
2. Variable names (and, broader, readability) matter
3. Be lazy: reuse! “Not built here” is not a sin.
4. Share using modern technologies: GitHub vs USB sticks
5. Automate change submission and build in quality checks
6. Control your technical debt
7. Talk to software engineering people: we don’t always have
solutions but we can think together with you!