String Methods

Question 1

operation performed on strings, including theconcatmethod, results in…

Answer 1

a new string

Question 2

Concat can take ________ as arguments. it returns______

Answer 2

more than one strings.
all those strings combined into one

Question 3

String.prototype.includes()

Answer 3

• Theincludesmethod takes a string as the argument and returns a boolean signifying whether that string exists within the string thatincludeswas called on.
• includesalso takes an optional second argument that specifies which index in the string to start looking for the substring.

Question 4

String.prototype.trim()

Answer 4

• Thetrimmethod removes whitespace from both ends of the string it’s called on.
• Thetrimmethod is often useful when getting input from users, which can often contain unnecessary whitespace at either end.
• trimremoves any number of space characters as well as whitespace characters like\nand\t.

Question 5

String.prototype.charAt

Answer 5

ThecharAtmethod is nearly identical to using brackets on a string. It takes an index as an argument and returns the character at that index in the given string

The chief difference betweencharAtand[]occurs when using indices for characters that don’t exist:charAtreturns an empty string (‘’), while[]returns undefined:

Question 6

String.prototype.charCodeAt

Answer 6

• The methodcharCodeAtis similar tocharAt, but instead of returning the character at the given index, it returns theUnicode code pointorcharacter codeof the character at that index.
• A Unicode code point is the number that represents a given character at the machine level.
• If you don’t provide an index,charCodeAtassumes the index0.

Question 7

String.fromCharCode

Answer 7

• TheString.fromCharCodemethod does the opposite ofString.prototype.charCodeAt. It takes a character code (Unicode code point) and returns the character represented by that character code.
• Note thatfromCharCodeis not a prototype method. It’s instead what we call astatic methodor a function. It can only be called from the string constructor

Question 8

String.prototype.endsWith()

Answer 8

• Returns a boolean represenign if the calling string ends with the passed string. The string argument cant be a regEx.
• omitting the argument or passingundefinedcausesendsWith()to search for the string"undefined", which is rarely what you want.
• optional endposition argument if you don’t want the ending position to be str.length

Question 9

String.prototype.startsWith()

Answer 9

Same as endsWith but for starting position

Question 10

String.prototype.repeat()

Answer 10

• Therepeat() method ofString constructs and returns a new string which contains the specified number of copies of this string, concatenated together.