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$ curl repovive.com/roadmaps/javascript/strings-numbers/touppercase-and-tolowercase

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$ curl repovive.com/roadmaps/javascript/strings-numbers/touppercase-and-tolowercase

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toUpperCase and toLowerCase - Strings & Numbers | JavaScript | Repovive

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JavaScript22 sections · 783 units18h total

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toUpperCase and toLowerCase

Changing case

Convert strings to upper or lower case:

let text = "Hello World"
console.log(text.toUpperCase())  // "HELLO WORLD"
console.log(text.toLowerCase())  // "hello world"

Useful for case-insensitive comparisons:

let input = "YES"
if (input.toLowerCase() === "yes") {
  console.log("User agreed")
}

Remember: strings are immutable. These methods return new strings.