Obayanju

function foo(a) {
  var b = a*2;
  function bar(c) {
    console.log(a, b, c);
  }
  bar(b * 3);
}
foo(2); //2, 4, 12

Obayanju

function bar() {
  var a = 10;
  console.log(a, b, c);
}

Obayanju

function bar() {
  a = 10;
  console.log(a, b, c);
}

Obayanju

function boo() {
  a = 10;
}
boo();
console.log(a);//10

Obayanju

function foo(a) {
  var b = a*2;
  function bar(c) {
    console.log(a, b, c);
  }
  bar(b * 3);
}
foo(2); //2, 4, 12

Obayanju

function foo(a) {
  var b = a*2;
  function bar(c) {
    console.log(a, b, c);
  }
  bar(b * 3);
}
foo(2); //2, 4, 12

Obayanju

function foo() {
  var c = 10;
  function bar() {
    var c = 5;
    console.log(c);//5
  }
  bar();
}
foo();

Obayanju

function foo() {
  a = 2;
}
foo();
console.log(a);//2

Obayanju

//this code creates and adds properties to an object
var obj = {
    a:1,
    b:2,
    c:3
};

Obayanju

//this code changes the property values of object "obj"
//i.e the value of "a" was initially 1
obj.a = 2;
obj.b = 3;
obj.c = 4;