## Forum Discussion

# Javascript Math.pow

Hi any javascripters out there in this brilliant community.

I need the user to carry out some calculations. They enter a series of data, with the result being calculated for them. Everything goes well until the final calculation, which is to multiply one variable "NetFig" to the power of another variable called "NetPower". This is where I need some javascript (Math.pow).

I have no idea how javascript works, but I am an expert at copying and pasting. So I am looking for the code to:

- extract the two variables,
- do the calc
- give me the result

Please!

- MathNotermans-9Community Member
Basically this is the script you need...

`// connect with Storyline Player`

`let player = GetPlayer();`

`//Get the variables NetFig and NetPower`

`let nFig = player.GetVar("NetFig");`

`let nPow = player.GetVar("NetPower");`

`// Do the calculation and set a variable to it`

`let endRst = Math.pow(nFig, nPow);`

`// Set the Storyline variable to it, so it shows in Storyline`

`player.SetVar("EndResult",endRst);`

A few caveats to watch when implementing it. The vars NetFig and NetPower are numbers in Storyline. I added numeric inputs for them. If your variables are Strings...well you have to convert them to Numbers first.

Further is there the dreaded often despised internal functionality that Storyline ( still ! ) limits numeric values to 2 digits. Do try and input NetFig = 7 and NetPower = -2. You get 0.02 whereas it should be 0.02040816326530612. You can solve this by showing the endresults as Strings because internally both Storyline and Javascript do the calculation correct, but somehow numeric values get limited to 2 decimals when showing in Storyline.

And here you can test it...

https://360.articulate.com/review/content/d714fde1-7952-4530-8993-afc2c23e1b55/review - MathNotermans-9Community Member
As said... now you can see the full glory of all decimals... but the lower field is a textString, so make sure when doing calculations with it to convert it back to a Number.

https://360.articulate.com/review/content/d714fde1-7952-4530-8993-afc2c23e1b55/review

Code now is like this:`// connect with Storyline Player`

`let player = GetPlayer();`

`//Get the variables NetFig and NetPower`

`let nFig = player.GetVar("NetFig");`

`let nPow = player.GetVar("NetPower");`

`// Do the calculation and set a variable to it`

`let endRst = Math.pow(nFig, nPow);`

`//convert this to a string`

`let tmpString = endRst.toString();`

`// And set a Storyline String as endResult so you get more then 2 decimals`

`player.SetVar("EndResultStr",tmpString);`

`// Set the Storyline variable to it, so it shows in Storyline`

`player.SetVar("EndResult",endRst);`

- BryanTregunnaCommunity Member
- Math Notermans, you are Math Power! Thank you so much.