first letter of a string uppercase and rest lowercase in javascript code example

Example 1: js first letter to uppercase

function capitalizeFirstLetter(name) {
    return name.replace(/^./, name[0].toUpperCase())
}

Example 2: javascript string first letter lowercase

// for lowercase on first letter
let s = "This is my string"
let lowerCaseFirst = s.charAt(0).toLowerCase() + s.slice(1)