lstr be ToString(lprim). ReturnIfAbrupt(lstr). Let rstr be ToString(rprim). ReturnIfAbrupt(rstr). Return the String that is the result of concatenating lstr and rstr. ES2015 The Addition operator (+) 一部抜粋
or Type(rprim) is String, then Let lstr be ToString(lprim). ReturnIfAbrupt(lstr). Let rstr be ToString(rprim). ReturnIfAbrupt(rstr). Return the String that is the result of concatenating lstr and rstr.
Let lval be GetValue(lref). 3. ReturnIfAbrupt(lval). 4. Let rref be the result of evaluating MultiplicativeExpression. 5. Let rval be GetValue(rref). 6. ReturnIfAbrupt(rval). 7. Let lnum be ToNumber(lval). 8. ReturnIfAbrupt(lnum). 9. Let rnum be ToNumber(rval). 10.ReturnIfAbrupt(rnum). 11.Return the result of applying the subtraction operation to lnum and rnum. See the note below 12.7.5. ES2015 The Subtraction Operator (-) 抜粋
or Type(rprim) is String, then Let lstr be ToString(lprim). ReturnIfAbrupt(lstr). Let rstr be ToString(rprim). ReturnIfAbrupt(rstr). Return the String that is the result of concatenating lstr and rstr.
or Type(rprim) is String, then Let lstr be ToString(lprim). ReturnIfAbrupt(lstr). Let rstr be ToString(rprim). ReturnIfAbrupt(rstr). Return the String that is the result of concatenating lstr and rstr. 減法演算子に この記述はないッッ