Strings

Question 1

string object

Answer 1

let str = new String();

Object constructor, creates a new String OBJECT. You can still execute string methods on it, but it is considered an object.

Question 2

string literal

Answer 2

let str = “string”;

The primitive version of a string. When calling methods on this variable, it is autoboxed into a string object.

Question 3

charAt(index)

Answer 3

returns the character at the specified index

Question 4

charCodeAt(index)

Answer 4

returns the Unicode of the character at the specified index

Question 5

concat(string1, string2, …)

Answer 5

concats the passed in strings to the calling string. returns the newly concatted string

Question 6

endsWith(string OR char)

Answer 6

checks if the calling string ends with the input string or character. returns a boolean

Question 7

fromCharCode(unicode)

Answer 7

converts the unicode value into a character. returns that character

Question 8

includes(string OR char)

Answer 8

checks whether a string contains the specified string/characters. returns a boolean

Question 9

indexOf(any primitive)

Answer 9

returns the first index of the specified value in the calling string

Question 10

lastIndexOf(any primitive)

Answer 10

returns the position of the last found occurrence of the specified value in the calling string

Question 11

localeCompare(string)

Answer 11

compares two strings in the current locale. returns either 0, -1, or 1 (though you should simply check for values > or < zero, not specifically -1 & 1)

Question 12

repeat(number, string)

Answer 12

returns a new string containing the passed in string repeated the passed in number of times

Question 13

replace(any primitive OR regex, string)

Answer 13

returns a new string with the first occurrence of the primitive value or regex replaced with the passed in string

Question 14

replaceAll(any primitive OR regex, string)

Answer 14

returns a new string with all of the occurrences of the primitive value or regex replaced with the passed in string

Question 15

search(any primitive OR regex)

Answer 15

returns the index of the specified primitive or regex. Use this if you are using regex, otherwise indexOf will be the faster version

Question 16

slice(index one, index two)

Answer 16

returns a new string made up of the extracted portion of a string. uses index one and index two to determine the length & location of the substring. If only a single index is provided, it returns from that index to the end of the string.

NOTE: also works on arrays, also accepts negative values!!!!!

Question 17

split(splitting character/string)

Answer 17

returns an array of substrings made up of the original string divided by the splitting character

ex. “hello there”.split(‘ ‘) => [“hello”, “there”]

Question 18

startsWith(string OR character)

Answer 18

checks whether or not the string begins with the specified string or character

Question 19

substr(index start, length)

Answer 19

this returns a new string, which is a substring of the original calling string. the substring starts at the given starting index and extends to the length specified in the second arg.

Question 20

substring(index one, index two)

Answer 20

returns a new string made up of the extracted portion of a string. uses index one and index two to determine the length & location of the substring. If only a single index is provided, it returns from that index to the end of the string.

just use slice

Question 21

toLowerCase()

Answer 21

Converts a string to lowercase letters

Question 22

toUpperCase()

Answer 22

Converts a string to uppercase letters

Question 23

trim()

Answer 23

removes additional whitespace from the ends of the calling string and returns a new modified/updated string

Question 24

valueOf()

Answer 24

returns the primitive value of the string object (calling string)

Question 25

padStart(length, pad value)

padEnd(length, pad value)

Answer 25

returns a string that is padded to length using the pad value as the padding