JavaScript (Control Structures- Conditional)

Question 1

are the building blocks of logic in
JavaScript. They allow programs to make decisions and
repeat actions based on conditions

Answer 1

Control structures

Question 2

Control Structures
(Categories)

Answer 2

• Conditional (Decision-Making) Structures
• Loops

Question 3

allow a program to evaluate a
condition (a Boolean expression) and execute specific blocks
of code based on whether the condition is true or false.

Answer 3

Conditional structures

Question 4

• condition is a Boolean expression (evaluates to true or
  false).
• executes code only if a condition is true.
• If the condition is true, the code block inside the {}
  runs.
• If the condition is false, the code block is skipped

Answer 4

if statement

Question 5

• Adds an alternative path when the condition is false.
• The if part checks a condition.
• If the condition is true, the code inside the if block runs.
• If the condition is false, the code inside the else block
  runs instead.

Answer 5

If…else statemen

Question 6

• JavaScript checks the conditions from top to bottom.
• As soon as it finds a condition that is true, it executes
  that block and skips the rest.
• If no condition is true, the code inside the else block (if
  provided) runs.

Answer 6

if…else if…else

Question 7

is another control flow
structure, similar to if…else if…else, but it’s often cleaner
and easier to read when you’re checking a single variable or
expression against multiple possible values.
* Used when you’re comparing one value against many cases.
* A cleaner way to handle multiple specific values of a single
variable

Answer 7

switch Statement

Question 8

play a critical role
in
how expressions are evaluated in control flow
structures like if statements, loops, and ternary
operators. Understanding this concept is key to writing
efficient and bug-free code.

Answer 8

truthy and falsy values

Question 9

is a value that, when coerced to a boolean,
results in false.

Answer 9

falsy value

Question 10

is any value that is not falsy. In other
words, if a value is not one of the falsy values (listed
above), it is considered truthy.

Answer 10

truthy value

Question 11

falsy value example

Answer 11

1. false — the boolean value false.
2. 0 — the number zero.
   3.-0 — the negative zero (still falsy).
3. ”” (empty string) — an empty string is considered falsy.
4. null — represents the absence of a value.
5. undefined — represents an uninitialized or missing value.
6. NaN — represents “Not-a-Number,” the result of an invalid
   mathematical operation.

Question 12

truthy value

Answer 12

1. true — the boolean value true.
2. Any non-zero number — e.g., 1, -1, 42, etc.
3. Non-empty string — e.g., “hello”, “false”, “0”, “ “ (a
   string with a space).
4. [] (empty array) — an empty array is truthy.
5. {} (empty object) — an empty object is truthy.
6. function() — any function is truthy.
7. Infinity and -Infinity — both are truthy.
8. new Date() — any valid Date object is truthy