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import { useState } from 'react';
import styles from '../styles/Calculator.module.scss'
const App = () => {
const [display, setDisplay] = useState('0')
const [memory, setMemory] = useState([])
const [result, setResult] = useState([])
const onClear = () => {
setDisplay('0')
setMemory([])
}
const onNumber = n => setDisplay(p => display === '0' ? n.toString() : p+n)
const onMath = m => {
if (display !== '0') {
if (!result) {
setMemory(p => [
...p,
{ type: 'n', value: display },
{ type: 'm', value: m },
]);
} else {
setResult(false)
setMemory([
{ type: 'n', value: display },
{ type: 'm', value: m },
]);
}
setDisplay('0')
} else if (memory[memory.length - 1].type === 'm') {
setMemory(p => [...p.slice(0, -1), { type: 'm', value: m }]);
}
}
const newVal = (prevVal, curVal) => {
if (!prevVal || !prevVal.m) return 0;
if (prevVal.m === '+') {
return `${Number(prevVal.value) + Number(curVal.value)}`
}
if (prevVal.m === '-') {
return `${Number(prevVal.value) - Number(curVal.value)}`
}
if (prevVal.m === '*') {
return `${Number(prevVal.value) * Number(curVal.value)}`
}
if (prevVal.m === '/') {
return prevVal.value !== '0' && curVal.value !== '0'
? `${Number(prevVal.value) / Number(curVal.value)}`
: '0'
}
}
const onResult = () => {
if (memory.length > 2 || (memory.length > 1 && display !== '0')) {
const actions = display === 0
? memory
: [...memory, { type: 'n', value: display }]
const result = actions.reduce((prevVal, curVal) => {
return curVal.type === 'n'
? ({ value: newVal(prevVal, curVal), m: null })
: ({ value: prevVal.value, m: curVal.value })
})
setDisplay(result?.value || 0);
setResult(true)
if (display !== 0) {
setMemory(p => [...p, { type: 'n', value: display }])
}
}
}
return (
<>
<div className='window__submenu'>
<div>
<div onClick={onClear}>
Clear
</div>
</div>
</div>
<div className={styles.calculator}>
<div className={styles.display}>
<div>
{ memory.map(o => o.value).join(' ') }
</div>
<div>
{display}
</div>
</div>
<div className={styles.keys}>
<div>
{ [...Array(10).keys()].map(k => (
<div key={k} onClick={() => onNumber(k)}>{k}</div>
)) }
<div onClick={() => setDisplay(p => p+'.')}>.</div>
<div onClick={onResult}>=</div>
</div>
<div>
{['+','-','*','/'].map(m => (
<div key={m} onClick={() => onMath(m)}>{m}</div>
))}
</div>
</div>
</div>
</>
)
}
export default App
|
