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1 | | -class Calculator { |
2 | | - constructor(previousOperandTextElement, currentOperandTextElement) { |
3 | | - this.previousOperandTextElement = previousOperandTextElement |
4 | | - this.currentOperandTextElement = currentOperandTextElement |
5 | | - this.clear() |
6 | | - } |
7 | | - |
8 | | - clear() { |
9 | | - this.currentOperand = "" |
10 | | - this.previousOperand = "" |
11 | | - this.operation = undefined |
12 | | - } |
13 | | - |
14 | | - delete() { |
15 | | - this.currentOperand = this.currentOperand.toString().slice(0, -1) |
16 | | - |
17 | | - } |
18 | | - |
19 | | - appendNumber(number) { |
20 | | - if (number === "." && this.currentOperand.includes(".")) return |
21 | | - this.currentOperand = this.currentOperand.toString() + number.toString() |
22 | | - } |
23 | | - |
24 | | - chooseOperation(operation) { |
25 | | - if (this.currentOperand === "") return |
26 | | - if (this.previousOperand !== "") { |
27 | | - this.compute() |
28 | | - } |
29 | | - this.operation = operation |
30 | | - this.previousOperand = this.currentOperand |
31 | | - this.currentOperand = "" |
32 | | - } |
33 | | - |
34 | | - compute() { |
35 | | - let computation |
36 | | - const prev = parseFloat(this.previousOperand) |
37 | | - const curr = parseFloat(this.currentOperand) |
38 | | - if (isNaN(prev) || isNaN(curr)) return |
39 | | - switch (this.operation) { |
40 | | - case "+": |
41 | | - computation = prev + curr |
42 | | - break; |
43 | | - case "-": |
44 | | - computation = prev - curr |
45 | | - break; |
46 | | - case "×": |
47 | | - computation = prev * curr |
48 | | - break; |
49 | | - case "÷": |
50 | | - computation = prev / curr |
51 | | - break; |
52 | | - default: |
53 | | - return |
54 | | - } |
55 | | - this.currentOperand = computation |
56 | | - this.operation = undefined |
57 | | - this.previousOperand = "" |
58 | | - |
59 | | - } |
60 | | - |
61 | | - getDisplayNumber(number) { |
62 | | - const stringNumber = number.toString() |
63 | | - const integerDigits = parseFloat(stringNumber.split(".")[0]) |
64 | | - const decimalDigits = stringNumber.split(".")[1] |
65 | | - let integerDisplay |
66 | | - if (isNaN(integerDigits)) { |
67 | | - integerDisplay = "" |
68 | | - } else { |
69 | | - integerDisplay = integerDigits.toLocaleString("en", { maximumFractionDigits: 0 }) |
70 | | - } |
71 | | - if (decimalDigits != null) { |
72 | | - return `${integerDisplay}.${decimalDigits}` |
73 | | - } else { |
74 | | - return integerDisplay |
75 | | - } |
76 | | - } |
77 | | - |
78 | | - updateDisplay() { |
79 | | - this.currentOperandTextElement.innerText = this.getDisplayNumber(this.currentOperand) |
80 | | - if (this.operation != null) { |
81 | | - this.previousOperandTextElement.innerText = `${this.getDisplayNumber(this.previousOperand)} ${this.operation}` |
82 | | - } else { |
83 | | - this.previousOperandTextElement.innerText = "" |
84 | | - } |
85 | | - } |
86 | | -} |
87 | | - |
88 | | -const numberButtons = document.querySelectorAll('[data-number]'); |
89 | | -const operationButtons = document.querySelectorAll('[data-operation]'); |
90 | | -const equalsButton = document.querySelector('[data-equals]'); |
91 | | -const deleteButton = document.querySelector('[data-delete]'); |
92 | | -const allClearButton = document.querySelector('[data-all-clear]'); |
93 | | -const previousOperandTextElement = document.querySelector('[data-previous-operand]'); |
94 | | -const currentOperandTextElement = document.querySelector('[data-current-operand]'); |
95 | | - |
96 | | -const calculator = new Calculator(previousOperandTextElement, currentOperandTextElement) |
97 | | - |
98 | | -numberButtons.forEach(button => { |
99 | | - button.addEventListener("click", () => { |
100 | | - calculator.appendNumber(button.innerText) |
101 | | - calculator.updateDisplay() |
102 | | - }) |
103 | | -}) |
104 | | -operationButtons.forEach(button => { |
105 | | - button.addEventListener("click", () => { |
106 | | - calculator.chooseOperation(button.innerText) |
107 | | - calculator.updateDisplay() |
108 | | - }) |
109 | | -}) |
110 | | -equalsButton.addEventListener("click", button => { |
111 | | - calculator.compute() |
112 | | - calculator.updateDisplay() |
113 | | -}) |
114 | | -allClearButton.addEventListener("click", button => { |
115 | | - calculator.clear() |
116 | | - calculator.updateDisplay() |
117 | | -}) |
118 | | -deleteButton.addEventListener("click", button => { |
119 | | - calculator.delete() |
120 | | - calculator.updateDisplay() |
121 | | -}) |
122 | | -
|
| 1 | +class Calculator { |
| 2 | + constructor(previousOperandTextElement, currentOperandTextElement) { |
| 3 | + this.previousOperandTextElement = previousOperandTextElement |
| 4 | + this.currentOperandTextElement = currentOperandTextElement |
| 5 | + this.clear() |
| 6 | + } |
| 7 | + |
| 8 | + clear() { |
| 9 | + this.currentOperand = "" |
| 10 | + this.previousOperand = "" |
| 11 | + this.operation = undefined |
| 12 | + } |
| 13 | + |
| 14 | + delete() { |
| 15 | + this.currentOperand = this.currentOperand.toString().slice(0, -1) |
| 16 | + |
| 17 | + } |
| 18 | + |
| 19 | + appendNumber(number) { |
| 20 | + if (number === "." && this.currentOperand.includes(".")) return |
| 21 | + this.currentOperand = this.currentOperand.toString() + number.toString() |
| 22 | + } |
| 23 | + |
| 24 | + chooseOperation(operation) { |
| 25 | + if (this.currentOperand === "") return |
| 26 | + if (this.previousOperand !== "") { |
| 27 | + this.compute() |
| 28 | + } |
| 29 | + this.operation = operation |
| 30 | + this.previousOperand = this.currentOperand |
| 31 | + this.currentOperand = "" |
| 32 | + } |
| 33 | + |
| 34 | + compute() { |
| 35 | + let computation |
| 36 | + const prev = parseFloat(this.previousOperand) |
| 37 | + const curr = parseFloat(this.currentOperand) |
| 38 | + if (isNaN(prev) || isNaN(curr)) return |
| 39 | + switch (this.operation) { |
| 40 | + case "+": |
| 41 | + computation = prev + curr |
| 42 | + break; |
| 43 | + case "-": |
| 44 | + computation = prev - curr |
| 45 | + break; |
| 46 | + case "×": |
| 47 | + computation = prev * curr |
| 48 | + break; |
| 49 | + case "÷": |
| 50 | + computation = prev / curr |
| 51 | + break; |
| 52 | + default: |
| 53 | + return |
| 54 | + } |
| 55 | + this.currentOperand = computation |
| 56 | + this.operation = undefined |
| 57 | + this.previousOperand = "" |
| 58 | + |
| 59 | + } |
| 60 | + |
| 61 | + getDisplayNumber(number) { |
| 62 | + const stringNumber = number.toString() |
| 63 | + const integerDigits = parseFloat(stringNumber.split(".")[0]) |
| 64 | + const decimalDigits = stringNumber.split(".")[1] |
| 65 | + let integerDisplay |
| 66 | + if (isNaN(integerDigits)) { |
| 67 | + integerDisplay = "" |
| 68 | + } else { |
| 69 | + integerDisplay = integerDigits.toLocaleString("en", { maximumFractionDigits: 0 }) |
| 70 | + } |
| 71 | + if (decimalDigits != null) { |
| 72 | + return `${integerDisplay}.${decimalDigits}` |
| 73 | + } else { |
| 74 | + return integerDisplay |
| 75 | + } |
| 76 | + } |
| 77 | + |
| 78 | + updateDisplay() { |
| 79 | + this.currentOperandTextElement.innerText = this.getDisplayNumber(this.currentOperand) |
| 80 | + if (this.operation != null) { |
| 81 | + this.previousOperandTextElement.innerText = `${this.getDisplayNumber(this.previousOperand)} ${this.operation}` |
| 82 | + } else { |
| 83 | + this.previousOperandTextElement.innerText = "" |
| 84 | + } |
| 85 | + } |
| 86 | +} |
| 87 | + |
| 88 | +const numberButtons = document.querySelectorAll('[data-number]'); |
| 89 | +const operationButtons = document.querySelectorAll('[data-operation]'); |
| 90 | +const equalsButton = document.querySelector('[data-equals]'); |
| 91 | +const deleteButton = document.querySelector('[data-delete]'); |
| 92 | +const allClearButton = document.querySelector('[data-all-clear]'); |
| 93 | +const previousOperandTextElement = document.querySelector('[data-previous-operand]'); |
| 94 | +const currentOperandTextElement = document.querySelector('[data-current-operand]'); |
| 95 | + |
| 96 | +const calculator = new Calculator(previousOperandTextElement, currentOperandTextElement) |
| 97 | + |
| 98 | +numberButtons.forEach(button => { |
| 99 | + button.addEventListener("click", () => { |
| 100 | + calculator.appendNumber(button.innerText) |
| 101 | + calculator.updateDisplay() |
| 102 | + }) |
| 103 | +}) |
| 104 | +operationButtons.forEach(button => { |
| 105 | + button.addEventListener("click", () => { |
| 106 | + calculator.chooseOperation(button.innerText) |
| 107 | + calculator.updateDisplay() |
| 108 | + }) |
| 109 | +}) |
| 110 | +equalsButton.addEventListener("click", button => { |
| 111 | + calculator.compute() |
| 112 | + calculator.updateDisplay() |
| 113 | +}) |
| 114 | +allClearButton.addEventListener("click", button => { |
| 115 | + calculator.clear() |
| 116 | + calculator.updateDisplay() |
| 117 | +}) |
| 118 | +deleteButton.addEventListener("click", button => { |
| 119 | + calculator.delete() |
| 120 | + calculator.updateDisplay() |
| 121 | +}) |
| 122 | + |
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