How to convert string to upper and lowercase in JavaScript
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 casefirstLetter = str.charAt(0).toUpperCase(), // upper case the first characterstrWithoutFirstChar = lowerCaseString.slice(1); // remove first character from lower case stringreturn firstLetter + strWithoutFirstChar;}console.log(capitalize("javaScript"));console.log(capitalize("educative.io"));
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