JavaScript: Change the capitalization of all letters in a given string
JavaScript Basic: Exercise-149 with Solution
Write a JavaScript program to change the capitalization of all letters in a given string.
Pictorial Presentation:
Sample Solution:
HTML Code:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>Change the capitalization of all letters in a given string.</title>
</head>
<body>
</body>
</html>
JavaScript Code:
function change_case(txt) {
var str1 = "";
for (var i = 0; i < txt.length; i++) {
if (/[A-Z]/.test(txt[i])) str1 += txt[i].toLowerCase();
else str1 += txt[i].toUpperCase();
}
return str1;
}
console.log(change_case("w3resource"));
console.log(change_case("Germany"));
Sample Output:
W3RESOURCE gERMANY
Flowchart:
ES6 Version:
function change_case(txt) {
let str1 = "";
for (let i = 0; i < txt.length; i++) {
if (/[A-Z]/.test(txt[i])) str1 += txt[i].toLowerCase();
else str1 += txt[i].toUpperCase();
}
return str1;
}
console.log(change_case("w3resource"));
console.log(change_case("Germany"));
Live Demo:
See the Pen javascript-basic-exercise-149 by w3resource (@w3resource) on CodePen.
Improve this sample solution and post your code through Disqus
Previous: Write a JavaScript program to swap two halves of a given array of integers of even length.
Next: Write a JavaScript program to find the difference of the two given sets.
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JavaScript: Tips of the Day
How to insert an item into an array at a specific index (JavaScript)?
What you want is the splice function on the native array object.
arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:
var arr = []; arr[0] = "Jani"; arr[1] = "Hege"; arr[2] = "Stale"; arr[3] = "Kai Jim"; arr[4] = "Borge"; console.log(arr.join()); arr.splice(2, 0, "Lene"); console.log(arr.join());
Ref: https://bit.ly/2BXbp04
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