JS преобразование мат операций

Question

Пишу простой транслятор ,как преобразовать символы мат операций из String.
Пример "+" а должно получится просто +.
Спасибо большое.

Answer 1

Даниил Елин wrote, "I want don't uses this construction ,you can see bellow a part of code.
I have "+" and it should be +(without "if* and etc.).
Thanks.
switch(output[i]){
case "+":st.push(num2 + num1);
break;
case "-":st.push(num2 - num1);
break;
case "/":st.push(num2 / num1);
break;
case "*":st.push(num2 * num1);
break;
}"

Response:

Are you trying to make the evaluator from scratch?

If you don't like JavaScript's standard eval function because of its security issues, you could still use math.js's evaluate function here:
https://mathjs.org/docs/expressions/parsing.html

If you may be interested in math.js's evaluate method, also check my math expression evaluator here which depends on math.js:
https://code.sololearn.com/Wa14229a21a1

If you want to make your own from scratch and support multiple operators like +, -, /, *, also consider order of operation rules like b.e.d.m.a.s. Making your own expression evaluator can quickly get almost as tricky as writing your own programming language if you want to support a lot of operators, brackets...

Answer 2

What is your question?

I get the English as:
"I am writing a simple translator how to convert symbols of mat operations from String.
Example "+" and it should be just +.
Thank you so much."

I get that you're doing something but it doesn't say you're stuck on anything or want help. Did you run into a problem? Did you get stuck on something?

If you just want to evaluate expressions like "3 + 4", you could use JavaScript's eval function.

eval("3 + 4") returns 7.

eval("3 * 4") returns 12 so eval isn't restricted to + but I'm not sure if that's a problem to you.

Answer 3

I want don't uses this construction ,you can see bellow a part of code.
I have "+" and it should be +(without "if* and etc.).
Thanks.
switch(output[i]){
case "+":st.push(num2 + num1);
break;
case "-":st.push(num2 - num1);
break;
case "/":st.push(num2 / num1);
break;
case "*":st.push(num2 * num1);
break;
}