Given a string and the task is to process it character by character.
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JavaScript String toUpperCase() Method: This method converts a string to uppercase letters.
Syntax:
string.toUpperCase()
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Parameters: This method accepts single parameter str which is required. It specifies the string to be searched.
Return Value: It returns a string denoting the value of a string converted to uppercase.
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JavaScript String charAt() Method: This method returns the character at the passed index in a string. The index of characters starts from 0.
Syntax:
string.charAt(index)
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Parameters: This method accepts single parameter index which is required. It specifies the integer representing the index of the character to return.
Return Value: It returns a string, denoting the character at the passed index, or an empty string if the index number is invalid.
Example 1: This example processes the string letter by letter using for loop and converts each letter to uppercase separately.
html
<!DOCTYPE HTML> <html>
<head>
<title>
How to process each character of text
</title>
</head>
<body style = "text-align:center;">
<h1 style = "color:green;" >
GeeksForGeeks
</h1>
<p id = "GFG_UP" style =
"font-size: 15px; font-weight: bold;">
</p>
<button onclick = "gfg_Run()">
check
</button>
<p id = "GFG_DOWN" style =
"color:green; font-size: 20px; font-weight: bold;">
</p>
<script>
var el_up = document.getElementById("GFG_UP");
var el_down = document.getElementById("GFG_DOWN");
var str = "This is String";
el_up.innerHTML = "String = '"+str + "'";
function gfg_Run() {
var str_Upper = "";
for (var i = 0; i < str.length; i++) {
str_Upper += str.charAt(i).toUpperCase();
}
el_down.innerHTML = str_Upper;
}
</script>
</body>
</html>
|
Output:
- Before clicking on the button:
- After clicking on the button:
Example 2: This example processes the string letter by letter using for in loop and alerts each letter separately.
html
<!DOCTYPE HTML> <html>
<head>
<title>
How to process each letter of text
</title>
</head>
<body style = "text-align:center;">
<h1 style = "color:green;" >
GeeksForGeeks
</h1>
<p id = "GFG_UP" style =
"font-size: 15px; font-weight: bold;">
</p>
<button onclick = "gfg_Run()">
check
</button>
<script>
var el_up = document.getElementById("GFG_UP");
var str = "str";
el_up.innerHTML = "String = '" + str + "'";
function gfg_Run() {
for (var i in str) {
alert(" character = "+str.charAt(i));
}
}
</script>
</body>
</html>
|
Output:
- Before clicking on the button:
- After clicking on the button:
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