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JavaScript - Js Reduce

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I need to implement a function called map (it needs to be written using reduce) in the below code that takes an array (arr) and a function (iter) as its arguments and returns an array with all its items transformed by iter, e.g. map([1, 2, 3, 4, 5], function(x) {return x * 2;}) should return [2, 4, 6, 8, 10]

PHP Code:
(function(){
    var reduce = function(arr, iter, acc){
        var len = arr.length, i = 0;
        for (i = 0; i < len; i += 1) acc = iter(acc, arr[i], i);
        return acc;
    };
    var map = function(arr, iter){
        // Implementation code  should go here
        //
        //
    };
    return map([1, 2, 3, 4, 5], function(x){return x * 2;});
})();

Can anyone please help me?

Thanks

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Any Way To Reduce All These If Statements?

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Trying to check validation on some dropdowns with this but man it's ugly. Is there a way to make it cleaner?

Code:

function checkDrop() {
   var sMorn = document.getElementById('wcsave_10_msession');
	 var sAft = document.getElementById('wcsave_10_asession');
	 var mMast = document.getElementById('wcsave_10_session_mmastery');
	 var aMast = document.getElementById('wcsave_10_session_amastery');
	 var mConc1 = document.getElementById('wcsave_10_session_mconc1');
	 var mConc2 = document.getElementById('wcsave_10_session_mconc2');
	 var aConc1 = document.getElementById('wcsave_10_session_aconc1');
	 var aConc2 = document.getElementById('wcsave_10_session_aconc2');

	if(sMorn.options[sMorn.selectedIndex].value == 'Mastery session 1 - Computer Lab: Searching Essentials') {
			if ((sAft.selectedIndex ==0)) {
			alert('Choose either a mastery session OR 2 concurrent sessions for the morning AND afternoon.');
			return false;
			}
  	if ((sAft.selectedIndex ==2) && (aConc1.selectedIndex ==0) && (aConc2.selectedIndex ==0)) {
			alert('Choose either a mastery session OR 2 concurrent sessions for the morning AND afternoon.');
			return false;
			}
		if ((sAft.selectedIndex ==2) && (aConc1.selectedIndex ==1) && (aConc2.selectedIndex ==0)) {
			alert('Choose either a mastery session OR 2 concurrent sessions for the morning AND afternoon.');
			return false;
			}
		if ((sAft.selectedIndex ==2) && (aConc1.selectedIndex ==0) && (aConc2.selectedIndex ==1)) {
			alert('Choose either a mastery session OR 2 concurrent sessions for the morning AND afternoon.');
			return false;
			}
		}

	if(sAft.options[sAft.selectedIndex].value == 'Mastery session 2 - Beyond the Basics of Searching!') {
			if ((sMorn.selectedIndex ==0)) {
			alert('Choose either a mastery session OR 2 concurrent sessions for the morning AND afternoon.');
			return false;
			}
  	if ((sMorn.selectedIndex ==2) && (mConc1.selectedIndex ==0) && (mConc2.selectedIndex ==0)) {
			alert('Choose either a mastery session OR 2 concurrent sessions for the morning AND afternoon.');
			return false;
			}
		if ((sMorn.selectedIndex ==2) && (mConc1.selectedIndex ==1) && (mConc2.selectedIndex ==0)) {
			alert('Choose either a mastery session OR 2 concurrent sessions for the morning AND afternoon.');
			return false;
			}
		if ((sMorn.selectedIndex ==2) && (mConc1.selectedIndex ==0) && (mConc2.selectedIndex ==1)) {
			alert('Choose either a mastery session OR 2 concurrent sessions for the morning AND afternoon.');
			return false;
			}
		}	
	
		if(sMorn.options[sMorn.selectedIndex].value == 'Concurrent sessions 1-6') {
			if ((sAft.selectedIndex ==0)) {
			alert('Choose either a mastery session OR 2 concurrent sessions for the morning AND afternoon.');
			return false;
			}
  	if ((sAft.selectedIndex ==2) && (aConc1.selectedIndex ==0) && (aConc2.selectedIndex ==0)) {
			alert('Choose either a mastery session OR 2 concurrent sessions for the morning AND afternoon.');
			return false;
			}
		if ((sAft.selectedIndex ==2) && (aConc1.selectedIndex ==1) && (aConc2.selectedIndex ==0)) {
			alert('Choose either a mastery session OR 2 concurrent sessions for the morning AND afternoon.');
			return false;
			}
		if ((sAft.selectedIndex ==2) && (aConc1.selectedIndex ==0) && (aConc2.selectedIndex ==1)) {
			alert('Choose either a mastery session OR 2 concurrent sessions for the morning AND afternoon.');
			return false;
			}
		}

	if(sAft.options[sAft.selectedIndex].value == 'Concurrent sessions 7-12') {
			if ((sMorn.selectedIndex ==0)) {
			alert('Choose either a mastery session OR 2 concurrent sessions for the morning AND afternoon.');
			return false;
			}
  	if ((sMorn.selectedIndex ==2) && (mConc1.selectedIndex ==0) && (mConc2.selectedIndex ==0)) {
			alert('Choose either a mastery session OR 2 concurrent sessions for the morning AND afternoon.');
			return false;
			}
		if ((sMorn.selectedIndex ==2) && (mConc1.selectedIndex ==1) && (mConc2.selectedIndex ==0)) {
			alert('Choose either a mastery session OR 2 concurrent sessions for the morning AND afternoon.');
			return false;
			}
		if ((sMorn.selectedIndex ==2) && (mConc1.selectedIndex ==0) && (mConc2.selectedIndex ==1)) {
			alert('Choose either a mastery session OR 2 concurrent sessions for the morning AND afternoon.');
			return false;
			}
		}
	return true;
}