JavaScript with Sequence and Control Flow

These flashcards cover key concepts related to sequences, processing, output, and control flow in JavaScript.

Sequence

The order in which instructions are executed in a program.

Processing

Manipulating or computing data, often involving arithmetic or string operations.

Output

How a program communicates results to the user, commonly through console.log(), alert(), or document.write().

Control Flow

Determines the order in which instructions are executed in a program.

if Statement

A conditional statement that executes a block of code only if the condition is true.

if…else Statement

A conditional statement that provides an alternative block of code to execute if the initial condition is false.

if…else if…else Statement

A conditional statement useful for checking multiple conditions.

switch Statement

A control structure that executes code based on discrete values of an expression.

for Loop

A control flow statement that repeatedly executes a block of code a specified number of times.

while Loop

A control flow statement that repeatedly executes a block of code as long as a specified condition is true.

Input

How a program receives data from the user or external sources.

What are the three optional parts of a for loop's header statement?

Initialization, condition, and increment/decrement.

When is a for loop typically preferred over a while loop?

When the number of iterations is known beforehand.

What is a key difference between for and while loops regarding their termination condition?

A for loop's iteration count is often predetermined, while a while loop continues as long as a condition remains true, making it suitable for situations where the number of iterations is unknown.

What risk is associated with a while loop if its condition never becomes false?

An infinite loop, which can cause a program to freeze.

What are common ways a program can receive input from a user in a web browser?

Through form fields (e.g., <input>, <textarea>), prompt dialogs, or event listeners (e.g., keydown, click).

Besides user interaction, what are other sources of input for a program?

Data from files, network requests, databases, or sensors.