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How to convert string to upper and lowercase in JavaScript
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Converting strings to lowercase
In JavaScript, we can use the toLowerCase method to convert a string into a lowercase string. The toLowerCase method will return a new string.
var str = "UPPER Case"; var lowerCaseStr = str.toLowerCase(); console.log(lowerCaseStr);
Converting strings to uppercase
In JavaScript, we can also use the toUpperCase method to convert a string into an uppercase string. The toUpperCase method will return a new string.
var str = "uppercase"; var upperCaseStr = str.toUpperCase(); console.log(upperCaseStr);
Capitalize a string
We don’t have any in-build method to capitalize a string. However, we can implement our own method. The steps to capitalize a string are:
- Convert the string to lowercase
- Replace the first letter with an uppercase letter
function capitalize(str) {
const lowerCaseString = str.toLowerCase(), // convert string to lower case
firstLetter = str.charAt(0).toUpperCase(), // upper case the first character
strWithoutFirstChar = lowerCaseString.slice(1); // remove first character from lower case string
return firstLetter + strWithoutFirstChar;
}
console.log(capitalize("javaScript"));
console.log(capitalize("educative.io"));RELATED TAGS
javascript
string
case
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