Convert an Array of Strings to Uppercase

Write a function named toUpperCase that takes one parameter: arr, which is an array of strings. The function should return a new array with all the strings in arr converted to uppercase. ​

Example 1

Input: toUpperCase(["hello", "world"]);
Output: ["HELLO", "WORLD"]

Example 2

Input: toUpperCase(["JavaScript", "is", "fun"]);
Output: ["JAVASCRIPT", "IS", "FUN"]

Example 3

Input: toUpperCase(["openAI", "gpt-4"]);
Output: ["OPENAI", "GPT-4"]

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