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Module to wrap `console.group` around all methods
// A simple object with some methods,
// which throw errors when bad arguments are passed.
var maths = {
square : function (value) {
// Validity checking
if (arguments.length !== 1) {
throw new Error('square: Requires one and only one argument');
}
if (typeof value !== 'number') {
throw new Error('square: Requires numeric argument');
}
// Square it!
return value * value;
}
}
// This function will wrap all methods on an object
// with detailed logging information.
function wrapper (toWrap, identifier, collapse) {
// Determine how we're grouping
var grouping = collapse ? 'groupCollapsed' : 'group';
// Get all keys of our method and iterate over them
var methods = Object.keys(toWrap);
methods.forEach(function (method) {
// Get the original method
var oldMethod = toWrap[method];
// If it's not a function, we're done, skip it
if (typeof oldMethod !== 'function') { return; }
// Create our wrapped version!
toWrap[method] = function wrapped () {
var groupName = identifier + ': ' + method;
console[grouping](groupName);
console.log('%s args: %o', method, arguments);
try {
var value = oldMethod.apply(this, arguments);
console.log('%s return value: %o', method, value);
return value;
} catch (e) {
console.error('%s error: %o', method, e);
} finally {
console.log('%s: Exiting', method);
console.groupEnd(groupName);
}
};
});
};
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