functions in javascript

index.tsx
function functionName(parameters) {
  //code to be executed
  return result; //optional
}
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index.tsx
function greet(name) {
  console.log("Hello " + name);
}
greet("John"); //output: Hello John
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index.tsx
function multiply(num1, num2) {
  return num1 * num2;
}
console.log(multiply(2, 3)); //output: 6
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index.tsx
var sum = function(num1, num2) {
  return num1 + num2;
}
console.log(sum(2, 3)); //output: 5

function calculator(num1, num2, operation) {
  return operation(num1, num2);
}
console.log(calculator(4, 5, sum)); //output: 9
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