Strings

Question 1

length()

Answer 1

Returns the length of the string
* PROPERTY, NOT A METHOD
* Counts code units, not characters
*

The length of the string

String.length()

Question 2

charAt()

Answer 2

New string of single UTF-16 code unit @ pecified offset into the string
* charAt(index)
* if index is out of range, returns empty string

String representing the character @ index

String.prototype.charAt()

Question 3

concat()

Answer 3

Concatenates N number of strings
* concat(strN)
* Converts elements into string values
* concat() coerces its arguments directly to strings (while + coerces to primitives first)
*

New string containing the combined text of the strings provided

String.prototype.concat()

Question 4

indexOf()

Answer 4

Returns the index of the first occurrence of a specified substring in the string, or -1 if not present
* indexOf(searchString, position)
* searchString is the substring that is searched within the called string
* Case sensitive!

Index of the first occurrence of searchString

String.prototype.indexOf()

Question 5

lastIndexOf()

Answer 5

Returns the index of the last occurrence of a specified substring in the string, or -1 if not found.
* lastIndexOf(searchString, position)
* Case sensitive!

The index of the last occurrence of searchString found, if not, -1

Array.prototype.lastIndexOf()

Question 6

replace()

Answer 6

Replaces a specified substring with another string
* String pattern will only be replaced once

New string w/ N matches of the pattern replaced by specified replacement

String.prototype.replace(pattern, replacement)

Question 7

slice()

Answer 7

Returns a portion of the string
* Extracts up to, but not including indexEnd
*

A new string containing the extracted section of the string

String.prototype.slice(indexStart, indexEnd)

Question 8

split()

Answer 8

Splits the string into an array of substrings based on specified separator
* if separator is undefined, target string is returned wrapped in an array

An Array of strings, split @ each point separator occurs in the string

String.prototype.split(separator, limit )

Question 9

substring()

Answer 9

Returns a substring between two specified indexes
* extracts characters from indexStart up to not including indexEnd

A new string containing the specified part of the given string

String.prototype.substring(indexStart, indexEnd)

Question 10

toLowerCase()

Answer 10

Converts the string to lowercase
* Non-mutating method
* Does not affect the value of str itself

A new string representing the calling string converted to lower case

String.prototype.toLowerCase()

Question 11

toUpperCase()

Answer 11

Converts the string to uppercase
* Non-mutating method
* Does not affect the value of str itself

A new string representing the calling string converted to upper case

String.prototype.toUpperCase()

Question 12

trim()

Answer 12

Removes whitespace from the beginning and end of the string
* if there is no whitespace, essentially coppies str
* For more options, use trimStart() or trimEnd()

New string stripped of whitespace from both beginning and end

String.prototype.trim()