String Methods Quiz

What does the method charAt(index) return?

• A new string created from UTF-16 code units

• The index of the first occurrence of a value

• The character at the specified index

• The Unicode of the character

What is returned by charCodeAt(index) if the index is out of bounds?

• An empty string

• The length of the string

• The character at the last index

• NaN

What does String.fromCharCode(...) do?

• Replaces a substring in a string

• Finds the last occurrence of a value

• Converts a string to lowercase

• Returns a string from UTF-16 code units

What does the indexOf(searchValue[, fromIndex]) method return if the value is not found?

• 0

• -1

• null

• undefined

What is the purpose of the replace(searchValue, newValue) method?

• To convert a string to uppercase

• To split a string into an array

• To replace matches of a pattern with a new value

• To find the index of a character

What does the split(separator[, limit]) method return?

• A new string

• An array of substrings

• The length of the string

• The first character of the string

What does the substring(indexStart[, indexEnd]) method do?

• Returns a new substring from the specified start index

• Replaces a substring in the string

• Converts the string to lowercase

• Finds the last index of a character

What does the toLowerCase() method return?

• The length of the string

• The first character of the string

• A new string converted to lowercase

• The original string

What is the result of the expression '1' + 1 in JavaScript?

• '11'

• 2

• undefined

• NaN

What does the lastIndexOf(searchValue[, fromIndex]) method do?

• Converts the string to uppercase

• Replaces a substring in the string

• Returns the index of the last occurrence of a value

• Returns the index of the first occurrence of a value