js strings popular method

charAt, concat, includes, endsWith, indexOf, lastIndexOf, replace, slice, split, startsWith, substr, toLowercase, toUppercase, trim, trimStart, trimEnd

charAt():this method returns a string.

concat():This method concatenates the string arguments to the calling string and returns a new string.

includes():This method determines if one string may be found within another string, returning true or false as appropriate.

endsWith():This method determines if a string ends with the characters of a specified string, returning true or false as appropriate.

indexOf():This method 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.

lastIndexOf():The method returns the index within the calling String object of the last occurrence of the specified value, searching backwards from fromIndex. Returns -1 if the value is not found.

replace():This method 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. If pattern is a string, only the first occurrence will be replaced.

The original string is left unchanged.

slice():This method extracts a section of a string and returns it as a new string, without modifying the original string.

split():This method divides a String into an ordered list of substrings, puts these substrings into an array, and returns the array. The division is done by searching for a pattern; where the pattern is provided as the first parameter in the method's call.

startsWith():This method determines whether a string begins with the characters of a specified string, returning true or false as appropriate.

substr():This method returns a portion of the string, starting at the specified index and extending for a given number of characters afterwards.

toLowercase():The method returns the calling string value converted to lower case.

toUppercase():The method returns the calling string value converted to uppercase (the value will be converted to a string if it isn't one).

trim():The method removes whitespace from both ends of a string. Whitespace in this context is all the whitespace characters (space, tab, no-break space, etc.) and all the line terminator characters (LF, CR, etc.).

trimStart():The method removes whitespace from the beginning of a string. trimLeft() is an alias of this method.

trimEnd():The method removes whitespace from the end of a string. trimRight() is an alias of this method.