programmingParadigms.md

Programming paradigms

Ways of programming (patterns, styles, etc...).

Examples:

• Imperative programming
• Declarative programming
• Object-oriented programming
• Functional programming, etc...

Imperative programming

Imperative programs spend lines of code describing the specific steps used to achieve the desired results – the flow control, how to do things.

Declarative programming

Declarative programs abstract the flow control process, and instead spend lines of code describing the data flow: what to do.

Examples:

• Imperative mapping

  const doubleMap = numbers => {
    const doubled = [];
    for(var x = 0; x < numbers.length; x++){
      doubled.push(numbers[x] * 2);
    }
    return doubled;
  }
  console.log(doubleMap([2,3,4]));

• Declarative mapping:

  const doubleMap = numbers => numbers.map(n => n * 2);
  console.log(doubleMap([2,3,4]));

The declarative program abstracts the flow control using the functional map() function.