Example: accessing Keyboard Maestro variables from Yosemite JXA Javascript for Applications

KMVars.js

function run() {
 
 
	// KEYBOARD MAESTRO VARIABLES IN YOSEMITE JXA JAVASCRIPT FOR APPLICATIONS
	//	FINDING, CREATING, READING, UPDATING
 
	// SIMPLE EXAMPLE - TOGGLING A BOOLEAN KM VARIABLE FROM .js
 
	var strKMVarName = "flag";
 
	var oFlag,
		blnFlag;
 
 
	// Get a reference to a Keyboard Maestro variable (existing or new)
	function kmVar(k) {
		var kme = Application("Keyboard Maestro Engine"),
			vs = kme.variables,
			vks = vs.where({name:k});
				
		return vks.length ? vks[0] :
			vs.push(kme.Variable({'name': k})) && vs[k];
	}
 
	function jsBool(strBool) {
		return strBool === "true";
	}
 
	// GET A REFERENCE TO A KM VARIABLE BY NAME
	// ( CREATING THE KM VAR IF NOT FOUND )
 
	oFlag = kmVar(strKMVarName);
 
	// READ THE VALUE OF THE KM VAR (as a .js Boolean)
	blnFlag = jsBool(oFlag.value());
 
	// TOGGLE ITS VALUE
	oFlag.value = !blnFlag;
 
	// RETURN THE TOGGLED RESULT
	return jsBool(oFlag.value());
}