en.javascript.info/1-js/02-first-steps/08-operators/3-primitive-conversions-questions/task.md

importance: 5

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Type conversions

What are results of these expressions?

"" + 1 + 0
"" - 1 + 0
true + false
6 / "3"
"2" * "3"
4 + 5 + "px"
"$" + 4 + 5
"4" - 2
"4px" - 2
"  -9  " + 5
"  -9  " - 5
null + 1
undefined + 1
" \t \n" - 2

Think well, write down and then compare with the answer.