Strings

Question 1

What is concatenation?

Answer 1

Strings can be joined together to form new strings. That’s concatenation. It’s often done using the ‘+’ operator.

Question 2

What are upper, lower, length and subStrings called and what do they act on?

Answer 2

They’re special functions called methods. They act on a particular object and are called using the object’s name followed by a dot and the method’s name.

Question 3

What is x.upper?

Answer 3

• Changes all characters in string x to upper case.

- e.g. HELLO

Question 4

What is x.lower?

Answer 4

• Changes all characters in string x to lower case.

- e.g. hello

Question 5

What is x.length?

Answer 5

• Returns the number of characters in string x.

- e.g. 5

Question 6

What is x[i]?

Answer 6

• Extracts the character in position i from string x

- e.g. x[1] = “e”

Question 7

What is x.subString(a,b)?

Answer 7

• Extracts a string starting at position a with length b from string x.
• e.g. x.subString(3,2) = “lo”