calculator app in svelte producing wrong result with certain numbers [duplicate]

i am watching a crash course in svelte that creates a calculator app, also a beginner in javascript, when i do 1.1 x 3 it produces the result pic below but when i do 1.1 x 4 it show the correct result 4.4, anybody can figure out why?

UPDATE: it is not a precision error, second code below is the solution

<script lang="ts">  const numbers = ["1", "2", "3", "4", "5", "6", "7", "8", "9", "0", "."];  const operations = ["/", "x", "-", "+", "="];  let selectedOperation = "";  let display = "";  let firstNumber = "";  let secondNumber = "";  let isDisplayingResults = false;  // the selected operation in the calculator  const handleOperationClick = (operation: string) => {    // prevent selecting operation if firstNumber is empty    if (!firstNumber) return;    // if "=" is clicked check if secondNumber is empty then no action, else    if (operation === "=") {      if (!secondNumber) return;      // check if numbers has decimal point      const hasDecimalfirst = /\./.test(firstNumber);      const hasDecimalsecond = /\./.test(secondNumber);      let firstNum;      let secondNum;      // parse first number as integer if no decimal point else parse as float      if (!hasDecimalfirst) {        firstNum = parseInt(firstNumber);      } else {        firstNum = parseFloat(firstNumber);      }      // parse second number as integer if no decimal point else parse as float      if (!hasDecimalsecond) {        secondNum = parseInt(secondNumber);      } else {        secondNum = parseFloat(secondNumber);      }      let results = "";      // select operation based on selected operation      switch (selectedOperation) {        case "/":          results = (firstNum / secondNum).toFixed(2);          break;        case "x":          if (!hasDecimalfirst || !hasDecimalsecond) {            results = (firstNum * secondNum).toString();          } else {            results = (firstNum * secondNum).toFixed(2);          }          break;        case "+":          if (!hasDecimalfirst || !hasDecimalsecond) {            results = (firstNum + secondNum).toString();          } else {            results = (firstNum + secondNum).toFixed(2);          }          break;        case "-":          if (!hasDecimalfirst || !hasDecimalsecond) {            results = (firstNum - secondNum).toString();          } else {            results = (firstNum - secondNum).toFixed(2);          }          break;      }      display = results;      isDisplayingResults = true;    }    selectedOperation = operation;  };  const handleClear = () => {    firstNumber = "";    secondNumber = "";    selectedOperation = "";    display = "";    isDisplayingResults = false;  };  // the handler when selecting numbers in the calculator  const handleNumberClick = (number: string) => {    // clear all values after displaying the result when selecting a number    if (isDisplayingResults) {      handleClear();    }    // if display is empty and selected number is 0 then no action    // does not allow the initial number 0 assuming not float    if (!display && number === "0") return;    // if selected number is . and display already has . then no action    // does not allow more than one .    if (number === "." && display.includes(".")) return;    // no selected operation yet    if (!selectedOperation) {      // if display is empty and selected number is . assign to firstNumber then display      if (!display && number === ".") {        firstNumber = "0.";        return (display = firstNumber);      }      // if display is not empty append to current display and assign to firstNumber      firstNumber = `${firstNumber}${number}`;      return (display = firstNumber);    } else {      // already have a selected operation      // if display is empty and selected number is . assign to secondNumber then display      if (!display && number === ".") {        secondNumber = "0.";        return (display = secondNumber);      }      // if display is not empty append to current display and assign to secondNumber      secondNumber = `${secondNumber}${number}`;      return (display = secondNumber);    }  };</script><main><div class="calculator"><div class="results">{display}</div><div class="digits"><div class="numbers"><button class="btn btn-xlg" on:click={handleClear}>C</button>        {#each numbers as number (number)}<button            class={`btn ${number === "0" ? "btn-lg" : null}`}            on:click={() => handleNumberClick(number)}>            {number}</button>        {/each}</div><div class="operations">        {#each operations as operation (operation)}<button            class={`btn ${operation === selectedOperation ? "btn-silver" : "btn-orange"}`}            on:click={() => handleOperationClick(operation)}>            {operation}</button>        {/each}</div></div></div></main>

SOLUTION:

  // check if numbers has decimal point  const hasDecimalFirst = /\./.test(firstNumber);  const hasDecimalSecond = /\./.test(secondNumber);  // Parse numbers as integers if no decimal point, else parse as floats  const parseNumber = (number: string) => {    return hasDecimalFirst || hasDecimalSecond      ? parseFloat(number)      : parseInt(number);  };  const firstNum = parseNumber(firstNumber);  const secondNum = parseNumber(secondNumber);  let results = "";  // Perform the selected operation  switch (selectedOperation) {    case "/":      results = (firstNum / secondNum).toFixed(2);      break;    case "x":      results = (firstNum * secondNum).toFixed(        hasDecimalFirst || hasDecimalSecond ? 2 : 0      );      break;    case "+":      results = (firstNum + secondNum).toFixed(        hasDecimalFirst || hasDecimalSecond ? 2 : 0      );      break;    case "-":      results = (firstNum - secondNum).toFixed(        hasDecimalFirst || hasDecimalSecond ? 2 : 0      );      break;