Summary

Textual data is always enclosed in single or double quotation marks.
For example: 'Hello World' or "Hello World" — both represent valid textual data;
There are two different types of numbers in JavaScript:
- Integers;
- Floating-point numbers;
Floating-point numbers (also known as Floats) are numerical values that have a decimal part.
Examples: 1.234, 24.56, 3.1415, etc;
Negative numbers can be expressed by adding a minus (-) sign before the number. Examples: -27, -3.14, -123, etc;
Arithmetic operations can be performed on numbers using the following operators:
+, -, *, /, and **;
The order of arithmetic operations follows the basic rule of arithmetic (BODMAS or PEMDAS rules).


              12345678910111213
            
// Integer
console.log('Integer:', 42);

// Floating-Point Number
console.log('Floating-Point:', 3.14);

// Negative Number
console.log('Negative:', -27);

// Arithmetic Operations
console.log('Sum:', 42 + 3.14);

console.log('Product:', 42 * -27);

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Sezione 1. Capitolo 4

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Summary

Textual data is always enclosed in single or double quotation marks.
For example: 'Hello World' or "Hello World" — both represent valid textual data;
There are two different types of numbers in JavaScript:
- Integers;
- Floating-point numbers;
Floating-point numbers (also known as Floats) are numerical values that have a decimal part.
Examples: 1.234, 24.56, 3.1415, etc;
Negative numbers can be expressed by adding a minus (-) sign before the number. Examples: -27, -3.14, -123, etc;
Arithmetic operations can be performed on numbers using the following operators:
+, -, *, /, and **;
The order of arithmetic operations follows the basic rule of arithmetic (BODMAS or PEMDAS rules).


              12345678910111213
            
// Integer
console.log('Integer:', 42);

// Floating-Point Number
console.log('Floating-Point:', 3.14);

// Negative Number
console.log('Negative:', -27);

// Arithmetic Operations
console.log('Sum:', 42 + 3.14);

console.log('Product:', 42 * -27);

Tutto è chiaro?

Grazie per i tuoi commenti!

Sezione 1. Capitolo 4

Dealing with Numbers

Summary

1. Which of the following is the correct way to represent textual data?

2. Which of the following is NOT a valid number type?

3. Which of the following represents a Floating-Point Number?

4. Which of the following represents a negative number?

5. How would you multiply two numbers?

Dealing with Numbers

Summary

1. Which of the following is the correct way to represent textual data?

2. Which of the following is NOT a valid number type?

3. Which of the following represents a Floating-Point Number?

4. Which of the following represents a negative number?

5. How would you multiply two numbers?