Maccauhuru

//To invoke the function,i will call its name (addNumbers) and give it 2 parameters
addNumbers(5,2); // will output : 7
addNumbers(100,1); // will output : 101

//A simple function declaration named addNumbers that accepts 2 input parameters 
function addNumbers(num1,num2) {
  let sum = num1 + num2;
  return sum;
}

Maccauhuru

 //A simple function declaration named printName that accepts username as an input parameter 
function printName(username) {
  return "Your name is : " + username;
}

//To invoke the function , i will call its name (printName) and give it a parameter e.g "Simba"
 // or "David" or "Mary" etc , try it and use your own name!
printName("Simba"); // will output : "Your name is : Simba"
printName("David"); // will output : "Your name is : David"

Maccauhuru

 //A simple function expression named userName that accepts username as an input parameter 
const userName = function printName(username) {
  return "Your name is : " + username;
}

//To invoke the function , i will call its name (userName) and give it a parameter e.g "Simba"
 // or "David" or "Mary" etc , try it and use your own name!
userName("Simba"); // will output : "Your name is : Simba"
userName("David"); // will output : "Your name is : David"

Maccauhuru

//To invoke the function,i will try call its name (addNumbers) and give it 2 parameters
addNumbers(5,2); // Uncaught ReferenceError: addNumbers is not defined
addNumbers(100,1); // Uncaught ReferenceError: addNumbers is not defined

//A simple function expression named addNumbers that accepts 2 input parameters 
const addNumbers = function addTwoNumbers(num1,num2){
  let sum = num1 + num2;
  return sum;
}

Maccauhuru

//An anonymous function expression that accepts a single parameter (username)
const printName = function (username){
  return "Your name is : " + username;
}

//To invoke the function,i will call printName and give it a parameter e.g "Simba"
// or "David" or "Mary" etc , try it and use your own name!
printName("Simba"); // will output : "Your name is : Simba"
printName("David"); // will output : "Your name is : David"

Maccauhuru

//An ES6 Arrow function named addNumbers that accepts 2 input parameters 
const addNumbers = (num1,num2) =>{
  let sum = num1 + num2;
  return sum;
}

//To invoke the function,i will call its name (addNumbers) and give it 2 parameters
addNumbers(5,2); // will output : 7
addNumbers(100,1); // will output : 101

Maccauhuru

//An ES6 Arrow function named addNumbers that accepts 2 input parameters 
const addNumbers = (num1,num2) => {
  let sum = num1 + num2;
  return sum;
}

//To invoke the function,i will call its name (addNumbers) and give it 2 parameters
addNumbers(5,2); // will output : 7
addNumbers(100,1); // will output : 101

Maccauhuru

//Arrow function that takes any number as input
//adds 100 and returns the total
const addHundred = num => num + 100;

addHundred(1);//output : 101
addHundred(1000); //output : 1100

Maccauhuru

//Arrow function that uses an implicit return
const addNumbers = (num1,num2) => num1 + num2;

addNumbers(10,20); // 30

//Arrow function that uses a 'return' keyword in the block body
const addSomeNumbers = (num1,num2) => {
let total =  num1 + num2;
return total;
} 

Maccauhuru

//syntax for creating an IIFE

(function () {
   //functions statements go here
})();