/s
Seriously, any suggestion to complete this challenge?
change your checks to accept last operator given. At this moment doing something like 5, *, +, 5, your calculator rejects the second operator “+”, and does 5*5. But they want you to instead always accept the last operator as the one used to perform the operation, so 5+5.
The added catch is that if your second operand has a negative sign, it should be also removed. From the testcase of #13:
“5 * - + 5” = should produce an output of “10” : expected ‘-25’ to equal ‘10’
we can see that the last “+” not only overrode the original “*”, it removed the “-” as well. So as you type this sequence into your calculator you should see the following:
5
5*
5*-
5+
5+5
Hope that helps.
yes I understood the meaning, the joke was because I understood it late
what strategy should i use now? an hook like const [operator, setOperator] = useState('');?
ok thanks everyone for the help, I’m a fool, the solution was simple
now I would appreciate some advice to improve readability
switch (e.target.value) {
case '+':
if (lastChar === '-') {
console.log(lastChar.slice(-2));
lastChar = lastChar.slice(-2).replace(lastChar, '+');
setInput(input.substr(0, input.length - 2) + lastChar);
} else if (lastChar === '*' || lastChar === '/' || lastChar === '.') {
lastChar = lastChar.slice(-1).replace(lastChar, '+');
setInput(input.substr(0, input.length - 1) + lastChar);
} else if (currentValue !== lastChar) {
setInput(input + e.target.value);
}
return;
case '*':
if (lastChar === '-') {
lastChar = lastChar.slice(-2).replace(lastChar, '*');
setInput(input.substr(0, input.length - 1) + lastChar);
} else if (lastChar === '+' || lastChar === '/' || lastChar === '.') {
lastChar = lastChar.slice(-1).replace(lastChar, '*');
setInput(input.substr(0, input.length - 1) + lastChar);
} else if (currentValue !== lastChar) {
setInput(input + e.target.value);
}
return;
case '/':
if (lastChar === '-') {
lastChar = lastChar.slice(-2).replace(lastChar, '/');
setInput(input.substr(0, input.length - 1) + lastChar);
} else if (lastChar === '+' || lastChar === '*' || lastChar === '.') {
lastChar = lastChar.slice(-1).replace(lastChar, '/');
setInput(input.substr(0, input.length - 1) + lastChar);
} else if (currentValue !== lastChar) {
setInput(input + e.target.value);
}
return;
case '-':
if (lastChar === '.') {
return;
} else if (currentValue !== lastChar) {
return setInput(input + e.target.value);
}
return;
default:
return;
}