String API

Question 1

string.match(regexp)

Answer 1

Used to retrieve the matches when matching a string against a regular expression.

Question 2

string.indexOf(searchValue[, fromIndex])

Answer 2

Returns the index within the calling String object of the first occurrence of the specified value, starting the search at fromIndex, returns -1 if the value is not found.

Question 3

string.localeCompare(compareString)

Answer 3

Returns a number indicating whether a reference string comes before or after or is the same as the given string in sort order.

Question 4

string.charAt(index)

Answer 4

Returns the specified character from a string.

Question 5

Removes whitespace from the right end of the string.

Answer 5

string.trimRight()

Question 6

Removes whitespace from the left end of the string.

Answer 6

string.trimLeft()

Question 7

Returns the specified character from a string.

Answer 7

string.charAt(index)

Question 8

Executes the search for a match between a regular expression and this String object.

Answer 8

string.search(regexp)

Question 9

Used to retrieve the matches when matching a string against a regular expression.

Answer 9

string.match(regexp)

Question 10

Returns the characters in a string beginning at the specified location through the specified number of characters.

Answer 10

string.substr(start[, length])

Question 11

Combines the text of two or more strings and returns a new string.

Answer 11

string.concat(string2, string3[, …, stringN])

Question 12

Returns the index within the calling String object of the first occurrence of the specified value, starting the search at fromIndex, returns -1 if the value is not found.

Answer 12

string.indexOf(searchValue[, fromIndex])

Question 13

string.lastIndexOf(searchValue[, fromIndex])

Answer 13

Returns the index within the calling String object of the last occurrence of the specified value, or -1 if not found. The calling string is searched backward, starting at fromIndex.

Question 14

string.substr(start[, length])

Answer 14

Returns the characters in a string beginning at the specified location through the specified number of characters.

Question 15

string.search(regexp)

Answer 15

Executes the search for a match between a regular expression and this String object.

Question 16

Extracts a section of a string and returns a new string.

Answer 16

string.slice(beginslice[, endSlice])

• if not specified, endSlice is the end of the string
• beginSlice and endSlice can be negative numbers

Question 17

Returns the index within the calling String object of the last occurrence of the specified value, or -1 if not found. The calling string is searched backward, starting at fromIndex.

Answer 17

string.lastIndexOf(searchValue[, fromIndex])

Question 18

string.slice(beginslice[, endSlice])

Answer 18

Extracts a section of a string and returns a new string.

• beginSlice and endSlice can be negative
• if endSlice ommited, it extracts until the end of the string

Question 19

string.trim()

Answer 19

Removes whitespace from both ends of the string.

Question 20

str.replace(regexp|substr, newSubStr|function[, Non-standard flags]);

Answer 20

Returns a new string with some or all matches of a pattern replaced by a replacement. The pattern can be a string or a RegExp, and the replacement can be a string or a function to be called for each match.

Question 21

Returns a new string with some or all matches of a pattern replaced by a replacement. The pattern can be a string or a RegExp, and the replacement can be a string or a function to be called for each match.

Answer 21

str.replace(regexp|substr, newSubStr|function[, Non-standard flags]);

Question 22

string.concat(string2, string3[, …, stringN])

Answer 22

Combines the text of two or more strings and returns a new string.

Question 23

Splits a String object into an array of strings by separating the string into substrings.

Answer 23

string.split([separator][, limit])

Question 24

string.trimLeft()

Answer 24

Removes whitespace from the left end of the string.

Question 25

Returns a number indicating whether a reference string comes before or after or is the same as the given string in sort order.

Answer 25

string.localeCompare(compareString)

Question 26

string.split([separator][, limit])

Answer 26

Splits a String object into an array of strings by separating the string into substrings.

Question 27

string.trimRight()

Answer 27

Removes whitespace from the right end of the string.

Question 28

Removes whitespace from both ends of the string.

Answer 28

string.trim()