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.
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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
Parse an HTTP Cookie header string and return an object of all cookie name-value pairs
Example:
const parseCookie = str => str .split(';') .map(v => v.split('=')) .reduce((acc, v) => { acc[decodeURIComponent(v[0].trim())] = decodeURIComponent(v[1].trim()); return acc; }, {}); console.log(parseCookie('foo=bar; equation=E%3Dmc%5E2')); // { foo: 'bar', equation: 'E=mc^2' }
Output:
[object Object] { equation: "E=mc^2", foo: "bar" }
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