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Addition in Javascript is really amazing.
In Chrome and Firefox, {} + 1 equals number 1; but in Node.js, {} + 1 equals string ‘[object Object]1’. On other hand, 1 + {} equals ‘1[object Object]’ in both browsers and Node.js.
Who can explain why {} + 1 equals 1 in the browsers?
This a bit complicated. This happens, because most JavaScript engines interpret
{}as a code block, not object. Thus{}+1is essentially the same as+1. If you do (for example)then the code inside brackets
()will be interpreted as a expression, not code block. Thus{}becomes an actual object.Read this for more details:
http://www.2ality.com/2012/01/object-plus-object.html
The article also explains why it is different in Node.Js.