<\/span><\/h3>\n\n\n\nYou will also see that both var and let keywords can be used to create globally scoped variables, but the variables declared using let will not be a part of the global object. This is a very subtle difference. Here is an example to illustrate it.<\/p>\n\n\n\n
var a = 1; \/\/ globally scoped
let b = 2; \/\/ globally scoped but not part of the global object
console.log(window.a); \/\/ 1
console.log(window.b); \/\/ undefined<\/pre>\n\n\n\nIn the above code, we declare both variables a and b as global variables, using var and let keywords respectively. But only variable a is accessible using global object property window.a.<\/p>\n\n\n\n
Similarly, you cannot access globally scoped variables declared using let keyword, with this<\/em> object either.<\/p>\n\n\n\nvar a=1;
let b=2;
console.log(a); \/\/ 1
console.log(b); \/\/ 2
console.log(this.a); \/\/ 1
console.log(this.b); \/\/ undefined<\/pre>\n\n\n\n