Javascript string is a prototype function? -

i creating little shape class in javascript canvas kill time. wondering if below,

var shape = function (shape) {       // pseudo code      if (shape prototype function of shape) {          shape();      } }  shape.prototype.quad = function () {  } 

so above valid string quad prototypal function defined.

is possible?

given shape string, use in see if exists on shape.prototype

var shape = function (shape) {      if (shape in shape.prototype) {          shape.prototype[shape]();      } }; 

this of course doesn't give useful this value in shape.prototype.quad, can't tell want there.

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if meant constructor function, you'd use this instead.

var shape = function (shape) {      if (shape in this) {          this[shape]();      } }; 

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if want make it's function, use typeof.

 if ((shape in this) && typeof this[shape] === "function") {      this[shape]();  }