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String charAt() Method with Example in JavaScript
JavaScrpt String charAt() Method: Here, we are going to learn about the charAt() method with Example in JavaScript.
Submitted by IncludeHelp, on February 05, 2019
String charAt() Method
charAt() is a string method in JavaScript, it is used to get the character of specified index from the string.
Note:
- If there is no specified index with the chatAt() method – it returns the first character of the string.
- If index is outof range with the chatAt() method – it returns null ("").
Syntax
character = str.charAt([index]);
Parameters
- str is the main string, we are getting the character from.
- index is the position of the string, we want to get the character from. index is an optional parameter and it's default value is 0.
Sample Input/Output
Input:
str = "Hello123"
index: 0
Output:
"H"
Input:
str = "Hello123"
index: 5
Output:
"1"
Input:
str = "Hello123"
index: 10
Output:
""
Input:
str = "Hello123"
index: No index
Output:
"H"
Example
<html>
<head>
<title>JavaScipt Example</title>
</head>
<body>
<script>
var str = "Hello123";
document.write("char at 0 index: " + str.charAt(0) + "<br>");
document.write("char at 1 index: " + str.charAt(1) + "<br>");
document.write("char at 2 index: " + str.charAt(2) + "<br>");
document.write("char at 3 index: " + str.charAt(3) + "<br>");
document.write("char at 4 index: " + str.charAt(4) + "<br>");
document.write("char at 5 index: " + str.charAt(5) + "<br>");
document.write("char at 6 index: " + str.charAt(6) + "<br>");
document.write("char at 7 index: " + str.charAt(7) + "<br>");
//test with out of range index
document.write("char at 10 index: " + str.charAt(10) + "<br>");
document.write("char at -1 index: " + str.charAt(-1) + "<br>");
//without specifying the index in function
document.write("char at 0 index: " + str.charAt() + "<br>");
</script>
</body>
</html>
Output
char at 0 index: H
char at 1 index: e
char at 2 index: l
char at 3 index: l
char at 4 index: o
char at 5 index: 1
char at 6 index: 2
char at 7 index: 3
char at 10 index:
char at -1 index:
char at 0 index: H
JavaScript String Object Methods »
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