define function in javascript

1var x = myFunction(4, 3);     // Function is called, return value will end up in x
2
3function myFunction(a, b) {
4    return a * b;             // Function returns the product of a and b
5}

1function myFunction(){
2  document.write("Hello World!")
3}
4myFunction();

1function name(parameter1, parameter2, parameter3) {
2// what the function does
3}
4

1function myfunction() {
2  console.log("function");
3};
4
5myfunction() //Should say "function" in the console.
6
7function calculate(x, y, op) {
8  var answer;
9  if ( op = "add" ) {
10    answer = x + y;
11  };
12  else if ( op = "sub" ) {
13    answer = x - y;
14  };
15  else if ( op = "multi" ) {
16    answer = x * y;
17  };
18  else if ( op = "divide" ) {
19    answer = x / y;
20  };
21  else {
22    answer = "Error";
23  };
24  return answer;
25};
26
27console.log(calculate(15, 3, "divide")); //Should say 5 in console.
28//I hope I helped!

1function myFunction(var1, var2) {
2  return var1 * var2;
3}
43
5How to create a function in javascriptJavascript By TechWhizKid on Apr 5 2020
6function addfunc(a, b) {
7  return a + b;
8  // standard long function
9}
10
11addfunc = (a, b) => { return a + b; }
12// cleaner faster way creating functions!

1/* Declare function */
2function myFunc(param) {
3  // Statements 
4}