Lesson 7: Working with Characters and Strings

Question 1

What kind of type is Strings?

Answer 1

Primitive.

Question 2

What is backslash () used for?

Answer 2

To escape a char in string. Makes regular char special and special char literal.

Question 3

Show an example using backslash:

Answer 3

document.write(“Bob said, \ “I like that story." “)

Question 4

What is the + operator used for?

Answer 4

Joining strings.

Question 5

Show an example using the + operator:

Answer 5

let greeting = 'hello';
let name = 'molly';
let message = greeting + name;

Question 6

concat:

Answer 6

Joins strings and returns a copy of the joined string.

Question 7

indexOf:

Answer 7

Returns the position of the first occurrence of a specified value in a string.

Question 8

lastIndexOf:

Answer 8

Returns the position of the last occurrence of a specified value in a string.

Question 9

Repeat:

Answer 9

Returns a new string with a specified number of copies of the string it was called on.

Question 10

Replace:

Answer 10

Searches for a match between substring and a string, then replaces the substring with a new one.

Question 11

Split:

Answer 11

Splits a string into an array of substrings, then returns the new array.

Question 12

Substr:

Answer 12

Extracts a substring from a string beginning at a specified start position , and through the specified number of characters.

Question 13

toLowerCase:

Answer 13

Converts a string to lowercase letters.

Question 14

toUpperCase:

Answer 14

Converts a string to uppercase letters.

Question 15

What does a Template String do?

Answer 15

Extracts variable values enclosed in it with the format of ${variable}

Question 16

Show an example using Template String:

Answer 16

var total = 20;
var tax = 4;
msg = 'Total is ${total + tax} dollars)';
alert(msg);

Question 17

How do you define a string?

Answer 17

Enclosing it in single or double quotation marks.

Question 18

What does the ‘length’ property do?

Answer 18

It will return the number of characters in the string.

Question 19

Show an example using the length property:

Answer 19

var myString = "How long am I?";
alert(myString.length);

Question 20

What are some common Escape Sequences?

Answer 20

\t = tab
\" = double quote
\n = new line / line break