How can I get sin cos and tan to use degrees instead of radians

Question

When I m working with math in JS I would like its trig functions to use degree values instead of radian values  How would I do that

User · Answer

I like a more general functional approach:

/**
* converts a trig function taking radians to degrees
* @param {function} trigFunc - eg. Math.cos, Math.sin, etc.
* @param {number} angle - in degrees
* @returns {number}
*/
const dTrig = (trigFunc, angle) => trigFunc(angle * Math.PI / 180);

or,

function dTrig(trigFunc, angle) {
  return trigFunc(angle * Math.PI / 180);
}

which can be used with any radian-taking function:

dTrig(Math.sin, 90);
  // -> 1

dTrig(Math.tan, 180);
  // -> 0

Hope this helps!

User · Answer

I created my own little lazy Math-Object for degree  MathD   hope it helps     helper        converts degree to radians     param degree     returns  number      var toRadians   function  degree        return degree    Math PI   180              Converts radian to degree     param radians     returns  number      var toDegree   function  radians        return radians    180   Math PI             Rounds a number mathematical correct to the number of decimals     param number     param decimals  optional  default  5      returns  number      var roundNumber   function number  decimals        decimals   decimals    5      return Math round number   Math pow 10  decimals     Math pow 10  decimals       the object var MathD         sin  function number           return roundNumber Math sin toRadians number                cos  function number           return roundNumber Math cos toRadians number                tan  function number           return roundNumber Math tan toRadians number                asin  function number           return roundNumber toDegree Math asin number                acos  function number          return roundNumber toDegree Math acos number              atan  function number          return roundNumber toDegree Math atan number

User · Answer

You can use a function like this to do the conversion   function toDegrees  angle      return angle    180   Math PI       Note that functions like sin  cos  and so on do not return angles  they take angles as input  It seems to me that it would be more useful to you to have a function that converts a degree input to radians  like this   function toRadians  angle      return angle    Math PI   180       which you could use to do something like tan toRadians 45

User · Answer

Create your own conversion function that applies the needed math  and invoke those instead  http   en wikipedia org wiki Radian Conversion between radians and degrees

User · Answer

Multiply the input by Math PI 180 to convert from degrees to radians before calling the system trig functions   You could also define your own functions   function sinDegrees angleDegrees        return Math sin angleDegrees Math PI 180        and so on

[javascript] How can I get sin, cos, and tan to use degrees instead of radians?

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