I was surprised that most of these answers assumed that you wanted to handle an error rather than just output helpful debug traces for normal cases as well.

For example, I like using a console.log wrapper like this:

consoleLog = function(msg) {//See https://stackoverflow.com/a/27074218/470749
    var e = new Error();
    if (!e.stack)
        try {
            // IE requires the Error to actually be thrown or else the 
            // Error's 'stack' property is undefined.
            throw e;
        } catch (e) {
            if (!e.stack) {
                //return 0; // IE < 10, likely
            }
        }
    var stack = e.stack.toString().split(/\r\n|\n/);
    if (msg === '') {
        msg = '""';
    }
    console.log(msg, '          [' + stack[1] + ']');        
}

This ends up printing an output such as the following to my console:

1462567104174 [getAllPosts@http://me.com/helper.js:362:9]

See https://stackoverflow.com/a/27074218/ and also A proper wrapper for console.log with correct line number?

I was surprised that most of these answers assumed that you wanted to handle an error rather than just output helpful debug traces for normal cases as well.

For example, I like using a console.log wrapper like this:

consoleLog = function(msg) {//See https://stackoverflow.com/a/27074218/470749
    var e = new Error();
    if (!e.stack) {
        try {
            // IE requires the Error to actually be thrown or else the 
            // Error's 'stack' property is undefined.
            throw e;
        } catch (e) {
            if (!e.stack) {
                //return 0; // IE < 10, likely
            }
        }
    }
    var stack = e.stack.toString().split(/\r\n|\n/);
    if (msg === '') {
        msg = '""';
    }
    console.log(msg, '          [' + stack[1] + ']');        
}

This ends up printing an output such as the following to my console:

1462567104174 [getAllPosts@http://me.com/helper.js:362:9]

See https://stackoverflow.com/a/27074218/ and also A proper wrapper for console.log with correct line number?

I was surprised that most of these answers assumed that you wanted to handle an error rather than just output helpful debug traces for normal cases as well.

For example, I like using a console.log wrapper like this:

consoleLog = function(msg) {//See http://stackoverflow.com/a/27074218/470749
    var e = new Error();
    if (!e.stack)
        try {
            // IE requires the Error to actually be thrown or else the 
            // Error's 'stack' property is undefined.
            throw e;
        } catch (e) {
            if (!e.stack) {
                //return 0; // IE < 10, likely
            }
        }
    var stack = e.stack.toString().split(/\r\n|\n/);
    if (msg === '') {
        msg = '""';
    }
    console.log(msg, '          [' + stack[1] + ']');        
}

This ends up printing an output such as the following to my console:

1462567104174 [getAllPosts@http://me.com/helper.js:362:9]

See http://stackoverflow.com/a/27074218/ and also A proper wrapper for console.log with correct line number?

I was surprised that most of these answers assumed that you wanted to handle an error rather than just output helpful debug traces for normal cases as well.

For example, I like using a console.log wrapper like this:

consoleLog = function(msg) {//See https://stackoverflow.com/a/27074218/470749
    var e = new Error();
    if (!e.stack)
        try {
            // IE requires the Error to actually be thrown or else the 
            // Error's 'stack' property is undefined.
            throw e;
        } catch (e) {
            if (!e.stack) {
                //return 0; // IE < 10, likely
            }
        }
    var stack = e.stack.toString().split(/\r\n|\n/);
    if (msg === '') {
        msg = '""';
    }
    console.log(msg, '          [' + stack[1] + ']');        
}

This ends up printing an output such as the following to my console:

1462567104174 [getAllPosts@http://me.com/helper.js:362:9]

See https://stackoverflow.com/a/27074218/ and also A proper wrapper for console.log with correct line number?