Azubi-javascript

this is the missing repo to teach the core concepts about javascript

usage

The idea is to have failing tests and the azubis have to fix them.

npm install # once
npm run all # to run the whole test suite
npm run single -- <folder> # to run one specific suite

1. Datatypes

• what datatypes do exist in the programming language JavaScript? List them!
• what does coersion mean? Give me an example!

Now solve the test suite by fixing all the tests:

npm run single -- datatypes

2. Control structures

• what control structures do you know?
• given a loop that prints number from 1 to 5. Implement this with a for loop and a while loop.
• What is a fall-through in context of a switch statement?

Now solve the test suite by fixing all the tests:

npm run single -- controlstructures

3. Arrays

• what operations would you do with a list of elements? List them!
• why do you think is this true typeof [] == "object"? What makes an object an object in classical programming?

Now solve the test suite by fixing all the tests:

npm run single -- arrays

4. Objects

• Objects are container elements are also known as map, hashmap or key-value pair. Not much to it :-)

Now solve the test suite by fixing all the tests:

npm run single -- objects

5. Functions

• write a function in three different programming languages that returns the sum of two numbers, which have been given to the function as an argument.
• what is similar in all three implementations? what is different?
• explain variable shadowing. Give me an example!

Now solve the test suite by fixing all the tests:

npm run single -- functions

6. Scope

• What is the difference between declaration and definition? How does this relate to the concept of 'hoisting'. Explain!
• Watch https://www.youtube.com/watch?v=ZoFlcv2ByBo .
• What is hoisting again? What scopes does javascript use? List them!

Now solve the test suite by fixing all the tests:

npm run single -- scope

7. Prototypes

There are many definitions of 'prototype': 1) an original model on which something is patterned, 2) a standard or typical example, 3) a first full-scale and usually functional form of a new type or design of a construction. For JavaScript the first one applies!

• What types of languages do you know. Try to find 3 groups.
• What are the main concepts of an object-oriented programming language?
• every property of an js-object has to be stored in memory. Open your favorite browser and try to analyse the memory footprint of a website.

Now solve the test suite by fixing all the tests:

npm run single -- prototypes