What are some useful native JavaScript utilities?

What are some useful native JavaScript utilities?

Native JavaScript provides several built-in utilities like Array.prototype.map, Object.keys, and String.prototype.includes. These can help simplify your code.

Can you explain how to use Array.prototype.map?

Sure! Array.prototype.map creates a new array populated with the results of calling a provided function on every element in the calling array. For example: const numbers = [1, 2, 3]; const doubled = numbers.map(num => num * 2); This will give you [2, 4, 6].

What about Object.keys? How does it work?

Object.keys returns an array of a given object's own enumerable property names. For instance: const obj = {a: 1, b: 2}; const keys = Object.keys(obj); This will return ['a', 'b'].

Are there any other utilities I should know about?

Yes! You might also find String.prototype.includes useful for checking if a string contains a certain substring. It's very handy for string manipulation.