FreeCodeCamp - Javascript Calculator - PART 4

In this video series I'll show you step by step how I built the javascript calculator for FreeCodeCamp using the react library. In this video I'll be taking you through handling the four basic math operations - adding, subtracting, multiplying and diving - using the eval() function. 00:00 recap 00:30 explaining functionality 01:42 adding operator to state 02:25 cache all state properties in separate variables 02:55 switch 05:00 functionality for numbers 05:19 creating doMath() 06:22 getting the three arguments necessary 07:10 eval() 09:15 operator functionality 10:16 fixing the persisting operator 12:30 fixing division and multiplication 18:29 fixing the disappearing result Useful links: eval(): https://goo.gl/HNj5PJ