The triple equals (===) is a comparison operator used in programming languages like JavaScript. It checks whether the operands are equal in both value and type. Unlike the double equals (==) operator, which performs type coercion before comparison, the triple equals operator does not perform any type casting.

Here is an example usage of the triple equals operator in JavaScript:

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let num1 = 5;
let num2 = "5";

console.log(num1 === num2); // false
console.log(num1 === 5); // true
console.log(num2 === "5"); // true

In the example above, num1 and num2 have the same value "5", but they are of different types (number and string respectively), so num1 === num2 returns false. However, when comparing num1 with the literal 5, they are both of type number and have the same value, so num1 === 5 returns true. Similarly, num2 === "5" returns true because they have the same type and value.

The !==undefined comparison operator in JavaScript is used to check if a variable or an object property is not undefined. In JavaScript, undefined is a primitive value that is automatically assigned to variables that have been declared but have not been assigned a value. The !==undefined operator checks if the value of a variable is not equal to undefined.

Here's an example of how !==undefined can be used:

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let myVariable;

if (myVariable !== undefined) {
  console.log("myVariable has a value assigned");
} else {
  console.log("myVariable is undefined");
}

In the example above, the condition myVariable !== undefined checks if myVariable has a value assigned or if it is undefined. If myVariable is not undefined, the first block of code will be executed, otherwise, the second block will be executed.

!== means "not equal value or not equal type". It is a comparison operator in JavaScript that checks if the two values being compared are not equal in either value or data type.

For example, 5 !== "5" would return true because although the values are the same, the data types are not.

Here's an example code block in JavaScript:

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let num = 5;
let str = "5";

console.log(num !== str); // true
console.log(num !== 5); // false
console.log(num !== 6); // true

To add variables in an if else statement, you can use comparison operators to check the values of the variables. Here's an example in JavaScript:

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let num1 = 5;
let num2 = 10;

if (num1 < num2) {
  console.log("num1 is less than num2");
} else {
  console.log("num1 is greater than or equal to num2");
}

In this example, we define two variables num1 and num2. We then use the less than comparison operator (<) to check if num1 is less than num2. If it is, we print out a message saying so. If it's not, we print out a different message saying that num1 is greater than or equal to num2.

!== is a comparison operator in programming languages, meaning "Not Equal."

In some languages, != is used to denote the same thing, instead of !==.

Example in JavaScript:

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let x = 10;

if (x !== 10) {
  console.log("x does not equal 10")
}

The else keyword in Javascript is used to execute a statement when the condition of an if statement is false. For example, you can set the condition of an if statement with a comparison operator and then use an else statement to respond when the condition is false:

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if (x > y) {
  // run if condition is met
} else {
  // run if condition is not met
}