"Write a JS library of your own" 3. Add several methods for handling strings

1. Generate a duplicate string

if (! string.repeat) {    function  (count) {        returnnew Array (count + 1). Join ( this );    }}

2. Remove the opening and closing null characters

if (! String.Trim) {    function  () {        returnthis. replace (/^\s+|\s+$/g, " );    }}

3. Turn the "-" string into hump form. Here the second parameter of the Replace function is a function that receives three parameters, the first is the string to which the regular expression matches, the second is () the string to match, and the third is the index of the string to match.

function Camelize (s) {        returnfunction(Regmatch, strmatch) {            return strmatch.touppercase ();        });    }    lily[' camelize '] = camelize;

"Write a JS library of your own" 3. Add several methods for handling strings