js throw error
throw new Error('Whoops!')node js throw error
FactoryController.prototype.create = function (callback) {
//The throw is working, and the exception is returned.
throw new Error('An error occurred'); //outside callback
try {
this.check(function (check_result) {
callback(check_result);
});
} catch (ex) {
throw new Error(ex.toString());
}
}
FactoryController.prototype.create = function (callback) {
try {
this.check(function (check_result) {
//The throw is not working on this case to return the exception to the caller(parent)
throw new Error('An error occurred'); //inside callback
});
} catch (ex) {
throw new Error(ex.toString());
}
}throw new error(
try {
throw new Error('Whoops!')
} catch (e) {
console.error(e.name + ': ' + e.message)
}throw new error(
try {
throw "I'm Md Abdur Rakib"
console.log("You'll never reach to me", 123465)
} catch (e) {
console.log(e); // I'm Md Abdur Rakib
}throw new error()
/*
throw new Error("error"); is a javascript line made up of two elements which
are used to gether at most of the times in making of javascript libraries,
for people to use to make an action easier than normal, to give errors when
the people gave a spelling error or syntax error, as they gave a string
instead of a number, etc.
*/
// Is't usage is:
throw new Error("error");
/*
Like I said, throw new Error("error") has two elements, the first element
is throw and the second element is new Error("error")
throw is used to throw something in the console box, here it is used to
throw an error
new Error("error") is used to create a new Error object which has the
argument as "error", the argument is the error which should be shown in the
console, Error is an object which is predefined in javascript using a
constructor, you cannot change its definition using another constructor
named as Error
Most of the times, they both are used in pairs directly, in some rare, they
are used in pairs indirectly i.e. storing the error object in a variable and
throwing it in the console using throw
This case might happen very rare when you need to call the error using two
different loal variables which are in different functions, then you may do
this:
*/
var error;
function function1() {
let variable1 = "hello";
error = new Error("Error: " + variable1);
// error is now Error: hello
}
function function2() {
let varible2 = "world";
error = new Error(error + " " + variable2);
// and now the error is Error: hello world
}Copyright © 2021 Codeinu
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