Create a simple calculator that given a string of operators (), +, -, *, / and numbers separated by spaces returns the value of that expression. see example below

calculator.js

/**
Example:

Calculator().evaluate("2 / 2 + 3 * 4 - 6") # => 7
**/

const Calculator = function() {
    this.resolveMultiDivision = mathString => {
        var resolvedTop = mathString.replace(new RegExp(/(\d*\.?\d*)([\/\*])(\d*\.?\d*)/), (match, group1,group2,group3) => {
          return group2 === '*' ? group1 * group3 : group1 / group3;
        });
        
        let hasMoreToResolve = !!resolvedTop.match(/[/\/*]/g);
        
        if(hasMoreToResolve) {
          return this.resolveMultiDivision(resolvedTop);
        }

        return this.resolveSubAndAdd(resolvedTop);
    }

    this.resolveSubAndAdd = mathString => {
      console.log('resolveSubAndAdd', mathString)
      var resolvedTop = mathString.replace(new RegExp(/(\d*\.?\d*)([\-\+])(\d*\.?\d*)/), (match, group1,group2,group3) => {
        return group2 === '+' ? Number(group1) + Number(group3) : Number(group1) - Number(group3);
      });
      
      let hasMoreToResolve = !!resolvedTop.match(/[-+]/g);
      
      if(hasMoreToResolve) {
        return this.resolveSubAndAdd(resolvedTop);
      }
      return resolvedTop;
    }

    this.evaluate = string => {
      let nospace = string.replace(/ /gi,'');
      
      return this.resolveMultiDivision(nospace);
    }
  };