Please help me pass test 13 in javascript calculator

1

This is my attempt at it

const handleEqual = () => {
    const plusRegex = /\d(([/*-]+)?)?\+\d/g;
    const mulRegex = /\d(([/*+-]+)?)?\*\d/g;
    const divRegex = /\d(([/*+-]+)?)?\/\d/g;
    if (calc.input.match(plusRegex)) {
      setCalc(calc.input.replace(plusRegex, ""));
    } else if (calc.input.match(mulRegex)) {
      setCalc(calc.input.replace(mulRegex, ""));
    } else if (calc.input.match(divRegex)) {
      setCalc(calc.input.replace(divRegex, ""));
    } else {
      setCalc({ input: math.evaluate(calc.input).toString() });
    }
    setCalc({ input: math.evaluate(calc.input).toString() });
  };

Here is a link to my code:

2
  1. If 2 or more operators are entered consecutively, the operation performed should be the last operator entered (excluding the negative (-) sign.

You need to implement some code to handle the negative numbers

there’s also an error on this
12. I should be able to perform any operation (+, -, *, /) on numbers containing decimal points
and this link might help u out

1 Like
3

Hey! Thank you
Updated it to

const handleEqual = () => {
    const plusRegex = /(([/*-]+)?)?\+/g;
    const mulRegex = /(([/*+-]+)?)?\*/g;
    const divRegex = /(([/*+-]+)?)?\//g;
    const subRegex = /(([/*+-]+)?)?(([/*+-])?)?-/g;
    if (calc.input.match(plusRegex)) {
      setCalc(calc.input.replace(plusRegex, "+"));
    } else if (calc.input.match(mulRegex)) {
      setCalc(calc.input.replace(mulRegex, "*"));
    } else if (calc.input.match(divRegex)) {
      setCalc(calc.input.replace(divRegex, "/"));
    } else if(calc.input.match(subRegex)){
      if(calc.input.match(/(([/*+-]+)?)?\+-/g)){
        setCalc(calc.input.replace(/(([/*+-]+)?)?\+-/g, '+-'))
      } else if(calc.input.match(/(([/*+-]+)?)?\*-/g)){
        setCalc(calc.input.replace(/(([/*+-]+)?)?\*-/g, '*-'))
      } else if(calc.input.match(/(([/*+-]+)?)?\/-/g)){
        setCalc(calc.input.replace(/(([/*+-]+)?)?\/-/g, '/-'))
      } else if(calc.input.match(/(([/*+-]+)?)?--/g)){
        setCalc(calc.input.replace(/(([/*+-]+)?)?--/g, '--'))
      }
    }
    setCalc({ input: math.evaluate(calc.input).toString() });
  };

But i still can’t pass test 13

Ah yes, i asked for help in test 12 in another topic because I’m using mathjs to evaluate calculations and i need help tweaking the logic i used to pass test 11 to allow test 12 to pass

4

Finally solved this. Remembered that strings are immutable so, in every place i used the replace function i reassigned the string value i.e

 const handleEqual = () => {
    const plusRegex = /(([/*-]+)?)?\+/g;
    const mulRegex = /(([/*+-]+)?)?\*/g;
    const divRegex = /(([/*+-]+)?)?\//g;
    const subRegex = /(([/*+-]+)?)?(([/*+-])?)?-/g;
    if (calc.input.match(plusRegex)) {
      setCalc((calc.input = calc.input.replace(plusRegex, "+")));
    } else if (calc.input.match(mulRegex)) {
      setCalc((calc.input = calc.input.replace(mulRegex, "*")));
    } else if (calc.input.match(divRegex)) {
      setCalc((calc.input = calc.input.replace(divRegex, "/")));
    } else if (calc.input.match(subRegex)) {
      if (calc.input.match(/(([/*+-]+)?)?\+-/g)) {
        setCalc((calc.input = calc.input.replace(/(([/*+-]+)?)?\+-/g, "+-")));
      } else if (calc.input.match(/(([/*+-]+)?)?\*-/g)) {
        setCalc((calc.input = calc.input.replace(/(([/*+-]+)?)?\*-/g, "*-")));
      } else if (calc.input.match(/(([/*+-]+)?)?\/-/g)) {
        setCalc((calc.input = calc.input.replace(/(([/*+-]+)?)?\/-/g, "/-")));
      } else if (calc.input.match(/(([/*+-]+)?)?--/g)) {
        setCalc((calc.input = calc.input.replace(/(([/*+-]+)?)?--/g, "--")));
      }
    }
    setCalc({ input: math.evaluate(calc.input).toString() });
  };

Thank you @KittyKora
If you have any insight on how i can handle my other error pls help

1 Like