Скачать или смотреть [1,2,3] + [4,5,6] = ? | Addition between two array in javascript

In this short video, I explain why adding two arrays in JavaScript using the + operator results in "1,2,34,5,6" instead of concatenating the arrays as expected.

When you use the + operator with arrays, JavaScript implicitly converts the arrays to strings and then concatenates them. This behavior can be confusing if you're expecting the arrays to merge into a single array.

Key Points Covered:

Why [1,2,3] + [4,5,6] results in "1,2,34,5,6".

How JavaScript converts arrays to strings using the toString() method.

The correct way to merge arrays using concat() or the spread operator (...).
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