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functional.js
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functional.js
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function getUserInputValue(elementId) {
return document.getElementById(elementId).value
}
function validate(value) {
if (value.length === 0)
return false
return true
}
function calculate(firstNumber, secondNumber, operator) {
if (!validate(firstNumber) ||
!validate(secondNumber) ||
!validate(operator)) {
throw Error("Invalid inputtt.")
}
switch (operator) {
case "+":
return parseInt(firstNumber) + parseInt(secondNumber)
case "-":
return parseInt(firstNumber) - parseInt(secondNumber)
case "*":
return parseInt(firstNumber) * parseInt(secondNumber)
case "/":
return parseInt(firstNumber) / parseInt(secondNumber)
}
}
function handleSubmit(event) {
event.preventDefault()
const firstNumber = getUserInputValue("first-number")
const secondNumber = getUserInputValue("second-number")
const operator = getUserInputValue("operator")
try {
const result = calculate(firstNumber, secondNumber, operator)
console.log(result)
} catch (error) {
alert(error.message)
}
}
function connectForm(formId) {
const form = document.getElementById(formId)
form.addEventListener("submit", handleSubmit)
}
connectForm("number-input-form")