How to use JavaScript slice to extract the first and last letter of a string?

Eg: "Hello World"

I need the result as "dH".

Following is my jsfiddle :

/

How to use JavaScript slice to extract the first and last letter of a string?

Eg: "Hello World"

I need the result as "dH".

Following is my jsfiddle :

http://jsfiddle/vSAs8/

• javascript
• string

• 2 Wouldn't something like str[str.length-1] + str[0] be enough here? – Sirko Commented Nov 13, 2013 at 10:25
• s.substring(s.length-1)+s.substring(0,1); – Prasanth Commented Nov 13, 2013 at 10:25

4 Answers 4

Here's the cleanest solution :

var output = input.slice(-1)+input[0];

If you want more slice, there's also

var output = input.slice(-1)+input.slice(0,1);

And here are alternate fun (and less efficient) solutions :

var output = input.replace(/^(.).*(.)$/,'$2$1');

or

var output = input.match(/^.|.$/g).reverse().join('');

Substr works as well:

alert(test.substr(-1,1) + test.substr(0,1));

a.charAt(a.length-1) + a.charAt(0) 

var str = " Virat Kohali " 
var get_string_label = function(str){ 
  str = str.split(" "); 
  str = str.filter(res=>res.length>0); 
  str = str.map(function(res){ 
    return res[0].toUpperCase(); 
  }); 
  str = str.join(""); 
  return str; 
}; 
console.log(get_string_label(str));

str.split(" "); method splits a String object into an array of strings by separating the string into substrings, where it will find space in string.

then str.filter(res=>res.length>0) will filter out string having zero length (for "virat kohali" string you will get empty sub-string) after that using map function you can fetch your first letter