71 lines
No EOL
1.9 KiB
JavaScript
71 lines
No EOL
1.9 KiB
JavaScript
const screen = document.querySelector(".screen");
|
|
const buttons = document.querySelectorAll("button");
|
|
const operators = ["+", "-", "*", "/"];
|
|
|
|
buttons.forEach((button) => {
|
|
button.addEventListener ("click", displayToScreen);
|
|
});
|
|
|
|
|
|
function displayToScreen() {
|
|
|
|
if (this.className == "equal") {
|
|
let calc = new Calculator;
|
|
|
|
console.log(screen.textContent)
|
|
screen.textContent = calc.calculate(screen.textContent);
|
|
} else if (this.className == "clear") {
|
|
screen.textContent = "0";
|
|
} else {
|
|
let screenContent = screen.textContent;
|
|
|
|
if (this.className == "operator") {
|
|
screen.textContent += " ";
|
|
|
|
for (let i = 0; i < screenContent.length; i++ ) {
|
|
if (operators.includes(screenContent[i])) {
|
|
let calc = new Calculator;
|
|
|
|
console.log(screen.textContent);
|
|
result = calc.calculate(screen.textContent);
|
|
screen.textContent += result;
|
|
break;
|
|
}
|
|
}
|
|
|
|
screen.textContent += this.textContent + " ";
|
|
} else if (screen.textContent === "0" && this.className == "num") {
|
|
screen.textContent = this.textContent;
|
|
} else {
|
|
screen.textContent += this.textContent;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
function Calculator(str) {
|
|
console.log("Calculator has been called")
|
|
|
|
this.methods = {
|
|
"-": (a, b) => (a - b),
|
|
"+": (a, b) => (a + b),
|
|
"/": (a, b) => (a / b),
|
|
"*": (a, b) => (a * b)
|
|
};
|
|
|
|
this.calculate = function(str) {
|
|
let parts = str.split(" ");
|
|
a = +parts[0];
|
|
op = parts[1];
|
|
b = +parts[2];
|
|
|
|
if (isNaN(a) || isNaN(b)) {
|
|
return NaN;
|
|
}
|
|
if (!this.methods[op]) {
|
|
return "Operation not supported."
|
|
}
|
|
|
|
return this.methods[op](a, b);
|
|
};
|
|
} |