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darkcris1/solveExpression.js

Created January 3, 2021 11:23
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Find the unknown digit | Codewars
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solveExpression.js
function solveExpression(exp) {
for (let i = 0; i <= 9; i++) {
const ex = exp.replace(/\?/g, i).split('=')
if (/--/.test(ex[0])) {
ex[0] = ex[0].replace(/(-([0-9]+))/g, '($1)')
}
if (/\b00|00\b/g.test(ex.join('='))) continue
if (exp.includes(i)) continue
if (eval(ex[0]) == ex[1]) return i
}
return -1
}
console.log(solveExpression('123?45*?=100')) // 0
@Abdallah-50
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thanks this really helped

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