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calc.js
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calc.js
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const screen = document.querySelector(".calculator-screen");
const buttons = document.querySelectorAll(".number");
const operatorButtons = document.querySelectorAll(".operator");
const decimalButton = document.querySelector(".decimal");
const equalButton = document.querySelector(".equal-sign");
const clearButton = document.querySelector(".all-clear");
let currentNumber = '';
let numbers = [];
let operator = '';
const operations = {
"+" : (a, b) => a + b,
"-" : (a, b) => a - b,
"*" : (a, b) => a * b,
"/" : (a, b) => a / b
};
function addNumber(number){
currentNumber += number;
screen.value = parseFloat(currentNumber);
}
function addDecimal(){
if(!currentNumber.includes(decimalButton.value)){
currentNumber += decimalButton.value;
screen.value = parseFloat(currentNumber);
}
}
function addOperator(newOperator){
if(currentNumber !== '') // Uses the last operator clicked
numbers.push(parseFloat(currentNumber));
if(numbers.length == 2) calculate();
operator = newOperator;
currentNumber = '';
}
function calculate(){
const result = numbers.reduce(operations[operator]);
screen.value = result;
numbers = [result];
}
function clear() {
currentNumber = '';
numbers = [];
operator = '';
screen.value = 0;
}
buttons.forEach((button) => {
button.addEventListener("click", () => {
if(typeof currentNumber === 'number'){ // Sets the currentNumber into an empty String after the calculation
currentNumber = '';
}
addNumber(button.value)
})
});
operatorButtons.forEach((button) => {
button.addEventListener("click", () =>
addOperator(button.value))
});
decimalButton.addEventListener("click", addDecimal);
equalButton.addEventListener("click",() =>{
numbers.push(parseFloat(currentNumber));
calculate();
return currentNumber = parseFloat(screen.value),
numbers = [];
});
clearButton.addEventListener("click", clear);