Support basic Requirements:

• Basic Math Operators like '+', '-', '*', '/'
• Operator precedence, Ex: 1+2*3 = 1+6 = 7
• grouping () Ex: (1+2)*3
• External Variables Ex: 1+x where x is passed as a variable to Eval.
• Declaring variable.s Ex: x=6
• Boolean types and expressions like '==', '<', '>', '!', 'and', 'or'
• Special keywords like. if, each, etc
• Calling go functions from the expression