file_and_line.js

/**
 * Figure out how long it takes for a method to execute.
 *
 * @param {func} method to test
 * @param {int} iterations number of executions.
 * @param {Array} args to pass in.
 * @param {T} context the context to call the method in.
 * @return {int} the time it took, in milliseconds to execute.
 */
var bench = function (method, iterations, args, context) {

    var time = 0;
    var timer = function (action) {
        var d = +(new Date);
        if (time < 1 || action === 'start') {
            time = d;
            return 0;
        } else if (action === 'stop') {
            var t = d - time;
            time = 0;
            return t;
        } else {
            return d - time;
        }
    };

    var result = [];
    var i = 0;
    timer('start');
    while (i < iterations) {
        result.push(method.apply(context, args));
        i++;
    }

    var execTime = timer('stop');

    if ( typeof console === "object") {
        console.log("Mean execution time was: ", execTime / iterations);
        console.log("Sum execution time was: ", execTime);
        console.log("Result of the method call was:", result[0]);
    }

    return execTime;
};




function noop() {
    return 2 * 2;
}


function getFileAndLine() {
    var self = this;
    var saveLimit = Error.stackTraceLimit;
    var savePrepare = Error.prepareStackTrace;
    Error.stackTraceLimit = 1;
    Error.captureStackTrace(this, getFileAndLine);
    Error.prepareStackTrace = function(_, stack) {
        self.file = stack[0].getFileName();
        self.line = stack[0].getLineNumber();
    };
    this.stack;
    Error.stackTraceLimit = saveLimit;
    Error.prepareStackTrace = savePrepare;
    return {
        file: self.file,
        line: self.line
    }
}


bench(noop, 10000, [], this);

console.log('\n\n\n');
bench(getFileAndLine, 10000, [], this);

$ node fileline.js
Mean execution time was: 0.0001
Sum execution time was: 1
Result of the method call was: 4

Mean execution time was: 0.011
Sum execution time was: 110
Result of the method call was: { file: '/Users/mark/work/fileline.js', line: 31 }
bluesnoop:work mark$