Mastering JavaScript Control Structures

What is the basic syntax of a for loop in JavaScript?

• for (initialization; increment) // code to be executed

• for (increment; condition) { // code }

• for (condition; initialization; increment) { // code }

• for (initialization; condition; increment) { // code to be executed }

How do you declare a variable in a for loop?

• You declare a variable in a for loop with 'assign'.

• You declare a variable in a for loop using 'declare'.

• You declare a variable in a for loop using 'let', 'const', or 'var'.

• You declare a variable in a for loop using 'define'.

What is the purpose of the initialization statement in a for loop?

• To determine the number of iterations in the loop.

• To execute the loop body only once.

• To increment the loop control variable after each iteration.

• To set the initial value of the loop control variable.

What is the difference between a for loop and a while loop?

• A for loop iterates a known number of times, while a while loop continues until a condition is false.

• A for loop is used for conditional statements, while a while loop is used for iteration.

• A for loop runs indefinitely, while a while loop stops after a set number of iterations.

• A for loop can only be used with arrays, while a while loop can be used with any data type.

Provide an example of a while loop that counts from 1 to 5.

• i = 1 while i <= 5: print(i) i += 1

• i = 1 while i < 5: print(i) i += 1

• i = 0 while i <= 5: print(i) i += 1

• i = 1 while i < 6: print(i) i += 2

What will happen if the condition in a while loop is always true?

• The loop will run a fixed number of times.

• The program will skip the loop entirely.

• The program will enter an infinite loop.

• The program will terminate immediately.

How do you write an if statement to check if a number is positive?

• if (number > 0) { /* code to execute if number is positive */ }

• if (number < 0) { /* code to execute if number is negative */ }

• if (number == 0) { /* code to execute if number is zero */ }

• if (number >= 0) { /* code to execute if number is non-negative */ }

What is the syntax for an if-else statement in JavaScript?

• if (condition) { // code to execute if condition is true } else { // code to execute if condition is false }

• if (condition) { // code } else if { // code }

• if condition { // code } else { // code }

• if (condition) // code else // code

How can you nest if statements in JavaScript?

• You must use a switch statement instead of if statements.

• Nesting if statements is not allowed in JavaScript.

• You can nest if statements by placing one if statement inside the block of another if statement.

• You can only use one if statement in JavaScript.

What is the purpose of the break statement in loops?

• The break statement pauses the loop execution.

• The break statement continues to the next loop iteration.

• The break statement terminates the loop execution.

• The break statement skips the current iteration of the loop.