Collection of problems to solve in JavaScript

1.

Given tesla object:

var tesla = {
  models: [
    {
      name: 'Model S'
    },
    {
      name: 'Model X'
    }
  ]
};

Write two functions: 1) getFirstModel that returns the first object from the models array and 2) getModelName that returns model's name. These functions should be called like this:

tesla.getFirstModel().getModelName(); // 'Model S'

Extra points: use this keyword.

1.1

Modify previous solution: instead of getFirstModel function, write getModel function that accepts number as a parameter. That number tells which object to return from models array.

Example:

tesla.getModel(1).getModelName(); // 'Model S'

1.2

Modify previous solution: instead of number, getModel should accept a function as a parameter. That function knows which object to return from models array.

Example:

tesla.getModel(getFirstModel).getModelName(); // 'Model S'

1.3

Modify previous solution: getModel function should accept two parameters - 1) a function that knows which model to return and 2) a function that knows which property of the model to return. Then write getIt function that actually returns the value of that property.

Example:

tesla.getModel(getFirstModel, getModelName).getIt(); // 'Model S'

1.4

In your previous solution avoid creating getModel property on tesla object.

For example, don't do this:

tesla.getModel = getModel;

Use Prototype Linking and Behaviour Delegation instead.

2.

Write processData function that takes data as a parameter and returns a sting made of numbers that are less than 10 and that are ordered in descending order. Use Array.prototype.map, Array.prototype.reduce, Array.prototype.filter, etc. instead of for loops.

For example, given lists object:

var lists = {
	list1: [10, 1, 22],
	list2: [7, 99, 12.5],
	list3: [0.75, 67, 11]
};

processData(lists); // returns `710.75`

Solutions

• Solutions