throw custom error javascript

js throw custom error

class CustomError extends Error {
  constructor(foo = 'bar', ...params) {
    // Pass remaining arguments (including vendor specific ones) to parent constructor
    super(...params)

    // Maintains proper stack trace for where our error was thrown (only available on V8)
    if (Error.captureStackTrace) {
      Error.captureStackTrace(this, CustomError)
    }

    this.name = 'CustomError'
    // Custom debugging information
    this.foo = foo
    this.date = new Date()
  }
}

try {
  throw new CustomError('baz', 'bazMessage')
} catch(e) {
  console.error(e.name)    //CustomError
  console.error(e.foo)     //baz
  console.error(e.message) //bazMessage
  console.error(e.stack)   //stacktrace
}

Posted by: Guest on July-19-2020

Source

JS Errors try Lets you define a block of code to test for errors catch Set up a block of code to execute in case of an error throw Create custom error messages instead of the standard JavaScript errors finally Lets you execute code, after try and catch, regardless of the result

Error.prototype.toString = function() { 'use strict'; var obj = Object(this); if (obj !== this) { throw new TypeError(); } var name = this.name; name = (name === undefined) ? 'Error' : String(name); var msg = this.message; msg = (msg === undefined) ? '' : String(msg); if (name === '') { return msg; } if (msg === '') { return name; } return name + ': ' + msg; };

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