What is a for-in loop in JavaScript?
An example of an AI chatbot conversation about for-in loops in JavaScript.
Can you explain what a for-in loop is in JavaScript?
Sure! A for-in loop is used to iterate over the properties of an object in JavaScript.
How does it differ from a for-of loop?
The for-in loop iterates over object properties, while the for-of loop iterates over iterable objects like arrays.
Can you give me an example of a for-in loop?
Of course! Here's an example:
const obj = {a: 1, b: 2, c: 3};
for (let key in obj) {
console.log(key, obj[key]);
}
What should I be careful about when using for-in loops?
Be cautious of inherited properties from the prototype chain. Use hasOwnProperty to filter them out.
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