Error : Object

constructor

An object thrown when an error occurs. There are several specific constructor functions for different types of error conditions: EvalError, RangeError, ReferenceError, SyntaxError, TypeError, URIError, NativeError.

Spec

Error(message : String) : Error

Same as new Error(message).

Spec

Error(message : String, options : Object) : Error

Same as new Error(message, options).

Spec

Constructors

new Error(message : String) : Error

Creates a new Error with the specified message that describes the error.

Example:

var divide = function(x, y) {
  if (y === 0) {
    throw new Error('divide by zero');
  }
  return x / y;
};

try {
  console.log(divide(10, 0));
}
catch (error) {
  console.log(error.name);
  console.log(error.message);
}

Run

Results:

Spec

new Error(message : String, options : Object) : Error

options : {

cause :

Error

}

Creates a new Error with the specified message that describes the error and original cause of the error.

Example:

var validateNumber = function(x) {
  if (typeof x !== 'number') {
    throw Error(x + ' is not a number');
  }
  return x;
};

var multiply = function(x, y) {
  try {
    return validateNumber(x) * validateNumber(y);
  }
  catch(e) {
    throw Error('Unable to multiply', { cause: e });
  }
};

try {
  console.log(multiply(3, 'abc'));
}
catch (error) {
  console.log(error);
  console.log('Cause:', error.cause);
}

Run

Results:

ECMAScript 2022 Spec

Instance Properties

message : String

A human readable message that describes the error.

Example:

try {
  foo;
}
catch (error) {
  console.log(error.message);
}

Run

Results:

Spec

name : String

The type of error.

Example:

try {
  foo;
}
catch (error) {
  console.log(error.name);
}

Run

Results:

Spec

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