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by hello_moto
5287 days ago
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That's definitely not obvious. Some people think in patterns or generalizations. String [binary_operator] Number = String String [binary_operator] Number = Number That's just begging for further explanation. Explaining JavaScript is probably more challenging than say Java. Java has many keywords and usages, but when it comes to explaining the concept of those keywords/semantics to students, it may be a little bit less confusing. |
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Left hand side is a string, and "+" is string concatenation as well as addition. So '5' + 3 = '53' (String concatenation). Just as "Hello" + 1 would equal "Hello1". The right hand side is converted to a string.
Left hand side is a string, but "-" is subtraction for numbers. JS converts the '5' to a number, then subtracts. So '5' - 3 = 2 (Numerical subtraction).
That's the explanation, and it's not terribly hard to get past.