Calculator

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If chain operation (e.g. 1 + 2 + ...):\n// calculate the previous pair of number\noperatorButtons.forEach((button) => {\n button.addEventListener(\"click\", () => {\n if (operator !== \"\" && num2 !== null) {\n calculate();\n }\n\n operator = button.value;\n displayValue = \"\";\n });\n});\n\nlet result = 0;\nconst equalsButton = document.querySelector(\".equals\");\nequalsButton.addEventListener(\"click\", () => {\n if (operator == \"divide\" && num2 === 0) {\n alert(\"LOL this user's trying to divide by zero 🫵😆\");\n return;\n }\n calculate();\n\n // Reset `operator` value only if calculate() is called\n // by the equals button,\n // not by operator button on chain operation\n operator = \"\";\n});\n\nconst clearButton = document.querySelector(\".clear\");\nclearButton.addEventListener(\"click\", () => {\n num1 = null;\n num2 = null;\n operator = \"\";\n displayValue = \"\";\n display.textContent = \"0\";\n});\n\nfunction assignOperand(number = parseFloat(displayValue)) {\n if (!operator) {\n num1 = number;\n } else {\n num2 = number;\n }\n}\n\nfunction calculate() {\n // 1. Call operate()\n // 2. Update display with operation result\n // 3. Assign the result to `num1` for next operation\n // (Will be used if user click operator button\n // but will be overwritten if user clicks\n // number button before operator button)\n // 4. 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Diff · v17