Jest suppresses the console log message by default. In order to show the console log message, set silent option to false at the command line set –silent=false in the command line: npm run test — –silent=false
Since original console is in window.console object, try restoring window.console from iframe: var i = document.createElement(‘iframe’); i.style.display = ‘none’; document.body.appendChild(i); window.console = i.contentWindow.console; // with Chrome 60+ don’t remove the child node // i.parentNode.removeChild(i); Works for me on Chrome 14.
The answer, for now, is no. The [[FunctionLocation]] property you see in Inspector is added in V8Debugger::internalProperties() in the debugger’s C++ code, which uses another C++ function V8Debugger::functionLocation() to gather information about the function. functionLocation() then uses a number of V8-specific C++ APIs such as v8::Function::GetScriptLineNumber() and GetScriptColumnNumber() to find out the exact information. All … Read more
console.log does indeed sort the properties, in some cases you can use JSON.stringify which preserves the order, e.g. console.log(JSON.stringify(obj, null /*replacer function */, 4 /* space */)) NB: contrary to the popular belief, js objects maintain the enumeration order, as per the OwnPropertyKeys specification (integers first, then other properties in insertion order)
In JavaScript, if nothing is returned from the function with the keyword return then undefined is returned by default. var data = greet(); console.log(data);// undefined, since your function does not return. Is equivalent to: console.log(greet()); The second output is the returned result from the function. Since you are not returning anything from the function hence … Read more
Actually there’s nothing in common between them. return – returns execution to the caller with optional result console.log() – logs out information in console.
You can use process.stdout.write(): process.stdout.write(“hello: “); See the docs for details.
You could also just overload the default console.log function: var fs = require(‘fs’); var util = require(‘util’); var log_file = fs.createWriteStream(__dirname + ‘/debug.log’, {flags : ‘w’}); var log_stdout = process.stdout; console.log = function(d) { // log_file.write(util.format(d) + ‘\n’); log_stdout.write(util.format(d) + ‘\n’); }; Above example will log to debug.log and stdout. Edit: See multiparameter version by … Read more
The console will print the result of evaluating an expression. The result of evaluating console.log() is undefined since console.log does not explicitly return something. It has the side effect of printing to the console. You can observe the same behaviour with many expressions: > var x = 1; undefined; A variable declaration does not produce … Read more
Console API is not a standard API that is defined in any specification but is something that is implemented across all browsers, so vendors are usually at their liberty to implement in their own fashion as there’s no standard spec to define the output of any methods in API. Unless you check the actual implementation … Read more