| search() | let sindex=str.search("sub-string"); | returns the position of the substring given in the string |
| slice(start,end) | let sub-str=str.slice(starting position,ending position); | slice extracts substring from the given string whose starting poistion is same as mentioned and ending position is end-1 |
| substring(start,end | let sub-str=str.substring(starting position,ending position); | substring is similar to slice where it can't accept negative values. |
| substr(start,length) | let sub-str=str.substr(starting position,length); | substr is similar to slice where the second parameter is length instead of end position |
| replace() | let x=str.replace("string to replace","replacement string") | this method is used to replace a particular text with another given text |
| concat() | let str3=str1.concat(" ",str2); | to join two strings |
| trim() | let str1= str.trim(); | to remove extra spaces on both sides of the string str |
| charAt() | let c=str.charAt(position); | returns the character present in the position |
| charCodeAt() | let c=str.charCodAt(position); | returns the unicode of the character present in the position |
| split() | let array=str.split(""); | to convert string to an array |
| length | let vln = str.length() | Returns length of the string named str |
| indexOf() | let index=str.indexOf("sub-string"); | returns the index of first occurence of the substring given |
| lastIndexOf() | let index=str.lastIndexOf("sub-string"); | returns the index of last occurence of the substring given |
| toUpperCase() | let str1=str.toUpperCase(); | to convert all the letters present in str to upper case |
| toLowerCase() | let str1=str.toLowerCase(); | to convert all the letters present in str to lower case |