Programming paradigms

JavaScript Paradigms

JS is:

• Functional*
• OOP
• ...

What is functionnal programming ?

Code style, Mindset

• Computation as the evaluation of mathematical functions
• Avoid changing-state and mutable data
• ...

Principles

• Pure function

  • Same input => Same output

  • No side effect

  • This is not a pure function

    var absolute_zero = -273.15;
    
    const celsiusToKelvin = (temp) => {
        return temp - absolute_zero;
    };

  • This is cool

    const celsiusToKelvin = (temp, absolute_zero) => {
        return temp - absolute_zero;
    };
    
    // OR
    
    const celsiusToKelvin = (temp) => {
        return temp + 273.15;
    };

• Immutability

• High order function

Resources