如何获取字符串的最后一个字符？

Question

How to get the last character of the string:

"linto.yahoo.com."

The last character of this string is "."

How can I find this?

Answer 1

An elegant and short alternative, is the String.prototype.slice method.

Just by:

str.slice(-1);

A negative start index slices the string from length+index , to length , being index -1 , the last character is extracted:

"abc".slice(-1); // "c";

Answer 2

Use charAt :

The charAt() method returns the character at the specified index in a string.

You can use this method in conjunction with the length property of a string to get the last character in that string.
For example:

 const myString = "linto.yahoo.com."; const stringLength = myString.length; // this will be 16 console.log('lastChar: ', myString.charAt(stringLength - 1)); // this will be the string

Answer 3

str.charAt(str.length - 1)

某些浏览器允许（作为非标准扩展）您将其缩短为：

str[str.length - 1];

Answer 4

You can achieve this using different ways but with different performance,

1. Using bracket notation:

var str = "Test"; var lastLetter = str[str.length - 1];

But it's not recommended to use brackets. Check the reasons here

2. charAt[index]:

var lastLetter = str.charAt(str.length - 1)

This is readable and fastest among others. It is most recommended way.

3. substring:

str.substring(str.length - 1);

4. slice:

str.slice(-1);

It's slightly faster than substring.

You can check the performance here

With ES6:

You can use str.endsWith("t");

But it is not supported in IE. Check more details about endsWith here

Answer 5

Use substr with parameter -1 :

"linto.yahoo.com.".substr(-1);

equals "."

Note:

To extract characters from the end of the string, use a negative start number (This does not work in IE 8 and earlier).

Answer 6

Using the String.prototype.at() method is a new way to achieve it

 const s = "linto.yahoo.com."; const last = s.at(-1); console.log(last);

Read more about at here

Answer 7

An easy way of doing it is using this :)

var word = "waffle"
word.endsWith("e")

Answer 8

您可以像这样获得最后一个字符：

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

Answer 9

Try this...

const str = "linto.yahoo.com."
console.log(str.charAt(str.length-1));

Answer 10

Use the JavaScript charAt function to get a character at a given 0-indexed position. Use length to find out how long the String is. You want the last character so that's length - 1. Example:

var word = "linto.yahoo.com.";
var last = word.charAt(word.length - 1);
alert('The last character is:' + last);

Answer 11

var firstName = "Ada";
var lastLetterOfFirstName = firstName[firstName.length - 1];

Answer 12

You can use the following. In this case of last character it's an overkill but for a substring, its useful:

var word = "linto.yahoo.com.";
var last = ".com.";
if (word.substr(-(last.length)) == last)
alert("its a match");

Answer 13

If you have or are already using lodash, use last instead:

_.last(str);

Not only is it more concise and obvious than the vanilla JS, it also safer since it avoids Uncaught TypeError: Cannot read property X of undefined when the input is null or undefined so you don't need to check this beforehand:

// Will throws Uncaught TypeError if str is null or undefined
str.slice(-1); // 
str.charAt(str.length -1);

// Returns undefined when str is null or undefined
_.last(str);

Answer 14

How to get the last character of the string:

"linto.yahoo.com."

The last character of this string is "."

How can I find this?

Answer 15

You can use this simple ES6 method

 const lastChar = (str) => str.split('').reverse().join(',').replace(',', '')[str.length === str.length + 1 ? 1 : 0]; // example console.log(lastChar("linto.yahoo.com."));

This will work in every browsers.

Answer 16

 var string = "Hello"; var fg = string.length; fg = fg - 1; alert(string[fg]);

Answer 17

You can also convert string to array and get the last item,

var str = "Hello world!"; 
var arr = str.split('');
var lastItem = arr[arr.length - 1];