Lógica de Programação - Estruturas lógicas - Parte 02

Summary

This tutorial explores the use of decision and repetition structures in JavaScript through practical examples. The first example demonstrates a parts system with checks for weight, list capacity, and name validity. The second example focuses on a student registration system that loops through student indices to check if they are even or odd, using modulus operations. The video provides clear, step-by-step explanations of these coding concepts, helping learners understand how to implement conditionals and loops in JavaScript for various real-world applications.

Takeaways

• 😀 Decision structures in programming are used to check conditions like part weight, list capacity, and name length for registration validation.
• 😀 If the weight of a part is less than 100 grams, it cannot be registered in the system.
• 😀 The parts list can hold a maximum of 10 items. If it exceeds this number, no more parts can be added.
• 😀 The name of a part must be at least 3 characters long to be valid for registration.
• 😀 Conditional statements (if/else) are crucial in checking conditions and producing corresponding outputs based on the result.
• 😀 In the system setup, JavaScript's `console.log` function is used to display the results of checks like weight, list capacity, and name validity.
• 😀 Lists in JavaScript are declared using square brackets (`[]`), and their length can be checked using `.length`.
• 😀 Repetition structures (loops) are used to iterate through lists, such as checking student indices for even or odd positions.
• 😀 The `for` loop in JavaScript can be used to iterate through a range of numbers, such as student indices, and perform checks like whether a number is even or odd.
• 😀 The modulo operator (`%`) is used to determine whether a number is divisible by another, which helps check if a number is even or odd.
• 😀 The `===` operator checks for both value and type equality, ensuring more precise comparisons in JavaScript.

Q & A

What is the purpose of the first decision structure example in the video?

The first decision structure example demonstrates how to register a part in a system based on three checks: weight, list capacity, and name validity.

What condition must the part meet regarding weight before it can be registered?

The part must weigh at least 100 grams to be registered. If it weighs less than 100 grams, a message will indicate that the part needs to meet the minimum weight requirement.

How does the system handle the capacity check for the list of parts?

The system checks the number of items in the list. If the list already has 10 parts, it prints a message saying there is no more space. If there is space, it prints a message indicating that more parts can still be registered.

What does the system check regarding the name of a part?

The system ensures that the part name has at least three characters. If the name has fewer than three characters, the system asks for a valid name.

How are these checks implemented in the code?

The checks are implemented using conditional (if-else) statements. The weight, list size, and name length are evaluated, and appropriate messages are printed based on the conditions.

What programming language is being used in the video for implementing these checks?

The video uses JavaScript to implement the decision structure and the checks for the system.

How does the second part of the video illustrate a repetition structure?

The second part introduces a repetition structure to check whether student numbers are even or odd. A loop is used to iterate through student indices, performing checks for even and odd numbers.

What is the significance of the modulo operator (%) in the second system?

The modulo operator is used to check if a number is divisible by 2. If the remainder of the division is zero, the number is even; otherwise, it is odd.

How does the loop work in the second example, where the number of students is checked?

A 'for' loop is used to iterate through a list of students, from index 0 to the total number of students. The loop checks if each student's index is even or odd and prints a corresponding message.

What happens if the number of students is less than the specified value in the loop condition?

The loop will not run, as the condition checks if the index number is less than the total number of students. If there are fewer students, the loop will skip or exit.