To console log a class in JavaScript, you can simply pass an instance of the class to the console.log() method. This will print the object to the console, showing both the properties and the method(s) associated with it. Here's an example:

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class Person {
  constructor(name, age) {
    this.name = name;
    this.age = age;
  }

  greet() {
    console.log(`Hello, my name is ${this.name} and I'm ${this.age} years old.`);
  }
}

const john = new Person('John', 30);
console.log(john);

This will output the following to the console:

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Person {name: "John", age: 30}
  age: 30
  name: "John"
  __proto__: Object

Alternatively, you could also define a toString() method within the class to customize the output when it's logged:

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class Person {
  constructor(name, age) {
    this.name = name;
    this.age = age;
  }

  greet() {
    console.log(`Hello, my name is ${this.name} and I'm ${this.age} years old.`);
  }

  toString() {
    return `${this.name} (${this.age})`;
  }
}

const john = new Person('John', 30);
console.log(john.toString());

This will output the following to the console:

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John (30)

The logical AND operator in JavaScript is represented by &&. It is used to combine two or more conditions and returns true only if all conditions are true.

Here’s a simple example:

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let a = true;
let b = false;

console.log(a && b); // Output: false

In this example, a is true, and b is false. The expression a && b evaluates to false because both conditions need to be true for the result to be true.

You can learn more about it in the MDN web docs.

parseFloat is a built-in JavaScript function that converts a string into a floating-point number (a number that can have decimals). It's useful when you want to take a string that represents a number and turn it into a format that you can perform calculations with.

Here's how it works:

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let stringNumber = "3.14";
let floatNumber = parseFloat(stringNumber);

console.log(floatNumber); // Outputs: 3.14
console.log(typeof floatNumber); // Outputs: "number"

In this example, parseFloat takes the string "3.14" and converts it to the number 3.14. If the string doesn't start with a number, it will return NaN (which means "Not-a-Number").

For more information, you can check the MDN documentation on parseFloat.

In JavaScript, a break statement is used to stop the execution of a loop or switch statement. When the break statement is reached, the program will exit the loop or switch and continue with the next line of code after it.

Here’s a simple example with a loop:

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for (let i = 0; i < 10; i++) {
    if (i === 5) {
        break; // Exit the loop when i is 5
    }
    console.log(i);
}

In this example, the loop prints numbers from 0 to 4. When i becomes 5, the break statement is executed, and the loop ends.

You can learn more about break statements in JavaScript on MDN Web Docs.