en.javascript.info/1-js/2-first-steps/8-operators/3-primitive-conversions-questions/task.md

Type conversions

[importance 5]

Let's recap type conversions in the context of operators.

What will be the result for expressions?

//+ no-beautify
"" + 1 + 0 
"" - 1 + 0
true + false
6 / "3"
"2" * "3"
4 + 5 + "px"
"$" + 4 + 5
 
"4" - 2
 
"4px" - 2

7 / 0
 
"  -9\n" + 5 
"  -9\n" - 5
null + 1
undefined + 1