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9.js
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9.js
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// ⭐: 9
const reactedPolymerSize = polymer =>
react(polymer).length
export const react = polymer => {
const reactedPolymer = reactOnce(polymer)
return polymer.length === reactedPolymer.length
? polymer
: react(reactedPolymer)
}
const reactOnce = polymer => {
let result = ''
for (let i = 1; i <= polymer.length;) {
const currentUnit = polymer[i - 1]
const nextUnit = polymer[i]
if (currentUnit && nextUnit && unitsAreSameTypeAndOppositePolarity(currentUnit, nextUnit)) {
i += 2
} else {
result += currentUnit
i += 1
}
}
return result
}
const unitsAreSameTypeAndOppositePolarity = (unitA, unitB) =>
Math.abs(unitA.charCodeAt(0) - unitB.charCodeAt(0)) === 32
export default reactedPolymerSize