面试题引起的f*ck
Examples
[] is equal ![]
Array is equal not array:
[] == ![]; // -> true ( What The f*ck Javascript )
💡 Explanation:
The abstract equality operator converts both sides to numbers to compare them, and both sides become the number 0 for different reasons. Arrays are truthy, so on the right, the opposite of a truthy value is false, which is then coerced to 0. On the left, however, an empty array is coerced to a number without becoming a boolean first, and empty arrays are coerced to 0, despite being truthy.
Here is how this expression simplifies:
+[] == +![];
0 == +false;
0 == 0;
true;
