Pass a string into a function and concatenate it into a parseable var

convert-string-to-var.js

// >> pass a string to the middle of a declared var >>>>>>>>>>>>>>>>

var n1x1, n1x2, n1y1, n1y2;

function someFunc(navNum){
	ctx.moveTo(eval(navNum+'x1'), eval(navNum+'y1'));
	ctx.lineTo(eval(navNum+'x2'), eval(navNum+'y2'));
	// ...
}

someFunc('n1');

// +++ Yes, Eval is evil, but not always, and i've not come across a better alternative to convert a string it into a var for this purpose