Functions

Basic Syntax: Standard way of writing functions.

function f(a,b){
    const sum = a + b;
    return sum;
}
console.log(f(1,5)); // Returns 6

You can use ...arg

Anonymous Syntax: Variable is name of function.

var f = function(a,b){
    const sum = a  + b;
    return sum;
}
console.log(f(1,5)); // Returns 6

Immediately Invoked Function Expression (IIFE): This form of function syntax allows for the encapsulation of a variable within a new scope.

const result = (function(a,b){
    const sum = a + b;
    return sum;
})(1,5);
console.log(result); // Returns 6

Arrow Syntax: A way to declare functions. However, it is used in more unique circumstances.

const f = (a, b) => {
    const sum = a + b;
    return sum;
};
console.log(f(1,5)); // Returns 6

Arrow syntax is different from function syntax because:

• More minimalistic. Useful for single-line functions.
• No automatic hoisting. You can use the function after it was declared. Good for readability.
• Cannot be bound to this, super, and arguments can be used as a constructor.

Omit Return: Shorter option for writing functions. You can omit the return keyword.

const f = (a, b) => a + b;
console.log(f(1,5)); // Returns 6