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{"@context":"https://schema.org","@type":"Code","url":"https://leetcodejavascript.com/solutions/basic-calculator","name":"#224 - Basic Calculator - LeetCode JavaScript Solutions","description":"Given a string s representing a valid expression, implement a basic calculator to evaluate it, and return the result of the evaluation. Note...","programmingLanguage":"JavaScript","codeRepository":"https://github.com/JoshCrozier/leetcode-javascript","codeSampleType":"JavaScript","text":"/**\n * @param {string} s\n * @return {number}\n */\nvar calculate = function(s) {\n  const stack = [];\n  let result = 0;\n\n  for (let i = 0, sign = 1; i < s.length; i += 1) {\n    if (s[i] >= '0' && s[i] <= '9') {\n      let value = 0;\n      while (s[i] >= '0' && s[i] <= '9') {\n        value = (value * 10) + (s[i] - '0');\n        i += 1;\n      }\n      result += value * sign;\n      i -= 1;\n    } else if (s[i] === '+') {\n      sign = 1;\n    } else if (s[i] === '-') {\n      sign = -1;\n    } else if (s[i] === '(') {\n      stack.push(result, sign);\n      result = 0;\n      sign = 1;\n    } else if (s[i] === ')') {\n      result = stack.pop() * result;\n      result += stack.pop();\n    }\n  }\n\n  return result;\n};","keywords":"LeetCode 224, #224 - Basic Calculator, Hard, JavaScript solution","learningResourceType":"Code","isAccessibleForFree":true,"educationalLevel":"intermediate","interactivityType":"mixed"}