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changes var keyword to let with notes #648

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changes var keyword to let with notes #648

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22 changes: 13 additions & 9 deletions docs/javascript/04-operator/04-operator.md
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Original file line number Diff line number Diff line change
Expand Up @@ -797,9 +797,9 @@ This **typeof** operator helps us to know the type of data, whether it is boolea

<body>
<script>
var a = true;
var b = "Hello";
var c = 42;
let a = true;
let b = "Hello";
let c = 42;

console.log("The datatype of A is :- " + typeof a); // Output for: "boolean"
console.log("The datatype of B is :- " + typeof b); // Output for: "string"
Expand Down Expand Up @@ -832,15 +832,16 @@ This **comma operator** evaluates each of its operands (from left to right) and

<body>
<script>
var x = 1,
let x = 1,
y = 2,
z = 3;

var result = (x++, y++, z++);
let result = (x++, y++, z++);

console.log("Value of x is :- " + x);
console.log("Value of y is :- " + y);
console.log("Value of z is :- " + z);
console.log("Result is :- " + result);
</script>
</body>
</html>
Expand All @@ -851,9 +852,12 @@ This **comma operator** evaluates each of its operands (from left to right) and
> Value of x is :- 2<br/>
> Value of y is :- 3<br/>
> Value of z is :- 4<br/>
> output of result is :- 3<br/>

In this example, the `comma operator` is used to evaluate the expressions x++, y++, and z++ sequentially. The variables x, y, and z are all `incremented by 1` as part of the evaluation.

The value 3 is assigned to result because the `comma operator` evaluates all expressions from left to right and returns the value of the last expression. Since z++ is a post-increment operator, it returns the old value of z, which is 3.

**3. STRING Operator:**

This **string operator** is primarily used for concatenation, which means joining two or more strings together. In JavaScript, the`+`operator is used for this purpose.
Expand All @@ -869,11 +873,11 @@ This **string operator** is primarily used for concatenation, which means joinin

<body>
<script>
var str1 = "Hello";
var str2 = "World";
var str3 = "!";
let str1 = "Hello";
let str2 = "World";
let str3 = "!";

var greeting = str1 + " " + str2 + str3;
let greeting = str1 + " " + str2 + str3;

console.log("Concatenated string is :- " + greeting);
</script>
Expand Down