如何在jquery中剪切字符串中的最后一个字符？

Question

suppose that i have

var name = "kanishka";

How can I cut only the last char so that the output will be 'a' instead?

i read the question

How can I cut the 1st char from a string in jquery?

by jin Yong ,

in this problem i know the length of the string . can u tell me how i can do this with out knowing the string length .

couldn't get help from the answers , please help

Answer 1

Using plain javascript, you can do

name.charAt(name.length-1)

More information on charAt http://www.w3schools.com/jsref/jsref_charat.asp

Answer 2

Array.prototype.pop.apply(name);

^_^

or if you want to be boring:

name.substr(name.length-1);

or:

name.split('').reverse().shift()

or:

name.split(name.substr(0, name.length-1)).pop()

or:

name.constructor.prototype.charAt.call(name.split('').reverse(), 0)

or:

var chr; name.split('').forEach(function(c){ chr=c; });

or (okay, these are serious):

/.$/.exec(name)[0]

or

name[name.length-1];

Answer 3

If you want the "a" in "kanishka":

var name = "kanishka";
name = name.substring(name.length - 1);

Gratuitous live example

Answer 4

name = name.substr(name.length-1,name.length);

Answer 5

A roundup of your options as presented by the various answers here:
(note that this is a CW answer, as it represents community content)

1. substring :

    var lastChar = name.substring(name.length - 1); 

   • Verbose, but clear.
   • Broadly-supported.
     
     

2. substr :

    var lastChar = name.substr(name.length - 1); 

   • Verbose (thought a tiny bit less so) , but clear.
   • Broadly-supported (though not strictly standard, and there are edge cases with some browsers; see comments) .
     
     

3. slice :

    var lastChar = name.slice(-1); 

   • Concise, clear once you're used to the idiom, but unclear to non-l33t c0d3rz.
   • Broadly-supported.
   • Tends to be slower or slowest on most browsers (but not all) .
     
     

4. charAt :

    var lastChar = name.charAt(name.length - 1); 

   • Verbose, but very clear.
   • Broadly-supported.
   • Fastest (or tied for fastest with [] ) on most browsers (usually by a fair margin).
     
     

5. [] :

    var lastChar = name[name.length - 1]; 

   • Concise and clear.
   • Not supported by IE7 and earlier.
   • Fastest (or tied for fastest with charAt ) on most browsers (usually by a fair margin).

(Due respect to cwolves' flights of outre approaches, I stuck to the mainstream like the boring plodder I am.)

Gratuitous jsperf test

Which should you use? It's totally up to you. Note that all of the options above are plenty fast, the odds that the speed of this operation are actually important in 99.999% of real-world cases are very low indeed.

Answer 6

一种简洁，简洁，跨浏览器的方式

name.slice(-1);