Meeting 2.1: Dart fundamentals

Consider the Dart code snippet. What are the final values of x, y, and z?

• a. x = 7, y = 6, z = 7

• b. x = 7, y = 5, z = 7

• c. x = 8, y = 5, z = 7

• d. x = 8, y = 6, z = 8

Classify the following variable declarations into var, final, or const:

Groups:

(a) Variable

,

(b) Constant

,

(c) Final

• 
• “y” can only be set once; you can’t reassign “y” after it’s set.

• Variables with immutable, fixed data types

• 
• “x” can be changed later by reassigning its value.

• “z” is immutable, so it can’t be reassigned.

• Also mutable, but their values can only be set once.

• 
• Variables with mutable data types

Given the Dart code snippet, what will be the output?

• Dart is used for Flutter development.

• $str1 is used for $str2 development.

• Compilation Error.

• Dart is used for development.

Complete the Dart code to concatenate two strings and assign the result to a variable:

d

$str1$str2'

'str1.concat(str2)'

'$str1 + $str2'

'str1 + str2'

Match each Dart string method with its correct description.

Groups:

(a) toUpperCase()

,

(b) substring(int start, int end)

,

(c) length

• Converts the entire string to uppercase.

• Extracts a portion of the string based on start and end indices.

• Returns the length of the string.

Consider the Dart code snippet. What are the final values of x, y, and z?

• x = 7, y = 6, z = 7

• x = 7, y = 5, z = 7

• x = 8, y = 5, z = 7

• x = 8, y = 6, z = 8

n a Dart program, you need to create a dynamic message that includes user input. Which Dart feature would you use for string interpolation, ensuring the user's input is correctly embedded in the message?

• String concatenation

• Template strings

• Raw strings

• String interpolation

​ (a)   can declare a variable that can hold a value of any type:

• dynamic
• var
• Object
• any
• final
• const

Sketch a brief flowchart depicting the process of type inference in Dart when declaring a variable without explicitly specifying its type (hint: use a decision diamond)

What is the variable scopes of 'a' and 'b'?

• a: Entire main() function, b: Inside the if block

• a: Inside the if block, b: Entire main() function

• a: Entire main() function, b: Outside the if block

• a: Inside the if block, b: Outside the if block