Run results for: Scores comp

Run details:

User agent: Mozilla/5.0 (Windows NT 6.1; rv:50.0) Gecko/20100101 Firefox/50.0

Browser: Firefox 50

Operating system: Windows 7

Device Platform: Other

Date tested: 7 years ago

Test name	Executions per second
REGEX STRING	5808.1 Ops/sec
LOOP w keys lookup	970.8 Ops/sec

Script Preparation code:

var arr = [];
for (var i = 2000; i--;) {
    var str = 'c';
    if (i === 1300) {
        str = 'i';
    }
    arr.push({
        status: str,
        score: 80,
        score_type: 0,
        status_date: '09-05-2016'
    });
}

var _op = RegExp(/[po]/g);
var _i = RegExp(/[^i]/g);
var _c = RegExp(/[^c]/g);
var _f = RegExp(/[^f]/g);
var _xn = RegExp(/cn|nc|fn|nf/g);

function computeStatus(arr) {
    arr = arr.map(obj => obj.status); /* flatten array into scores only*/
    arr = arr.join('') /* stringify */
        .replace(_op, 'c') /* treat passed & optional as completes */
        .replace(_xn, 'i') /* treat not started & (fail or passed) as incomplete */
    var Cstatus = arr.replace(_i, '') || arr.replace(_f, '') || arr.replace(_c, '') || 'n';
    return Cstatus.charAt(0);

}

function isComplete(str) {
    var comps = {
        'p': true,
        'c': true,
        'o': true
    };
    return comps[str] || false; //test the string if it is a completion grade status - returns boolean.
}

function computeStatus2(arr) {
    var stat, foundN, foundF, foundP, foundC;

    for (var i = arr.length; i--;) {
        //' Now loop through the recordset and calculate the status that the overall course should have
        var obj = arr[i];
        var keys = Object.keys(obj);
        stat = obj[keys[0]];

        if (!stat) { //consider null status as not started
            stat = 'n';
            foundN = true;
        } else {
            if (stat !== "i") { //process all non i status - n,f,p,c,o
                foundC = isComplete(stat); //look for completions
                foundF = (stat === 'f'); //look for failures
                foundN = (stat === 'n'); //look for not started
            } else { //exit with status of incomplete as soon as one is found
                return stat;
            }
        }
    }

    if (foundN) { //'if we found not started lessons and nothing else then course status is "not started"
        stat = "n";
        if (foundC || foundF) {
            stat = "i"; //'if a mix of not started lessons and completed or failed lessons status is incomplete
        }
    } else {
        if (foundF) {
            //'if no lessons not started and a single lesson is failed then the course status is "failed".
            stat = "f";
        } else {
            if (foundC) {
                //'if we get here then no lessons have been found to have been incomplete, not started or failed therefore set the lesson to "complete"
                stat = "c";
            }
        }
    }
    return stat;
}

Tests:

REGEX STRING
computeStatus(arr)
LOOP w keys lookup
computeStatus2(arr)

Run results for: Scores comp

REGEX STRING

LOOP w keys lookup