اشیای خطا در جاوا اسکریپت — به زبان ساده

1try{
2    throw new Error('Some Error Occurred!')
3} 
4catch(e){
5    console.error('Error Occurred. ' + e.name + ': ' + e.message)
6}

1try{
2    someFunction()
3} 
4catch(e){
5    if(e instanceof EvalError) {
6    console.error(e.name + ': ' + e.message)
7  } 
8  else if(e instanceof RangeError) {
9    console.error(e.name + ': ' + e.message)
10  }
11  // ... something else
12}

1class CustomError extends Error {
2    constructor(description, ...params) {
3    
4// Passing arguments (including vendor specific ones) to parent constructor
5    super(...params)
6// Maintains proper error stack trace(available only on JS V8 engine)
7    if(Error.captureStackTrace){
8      Error.captureStackTrace(this, CustomError)
9    }
10this.name = 'CustomError_MyError'
11    // Custom debugging information
12    this.description = description
13    this.date = new Date()
14  }
15}
16try{
17  throw new CustomError('Custom Error', 'Some Error Occurred')
18} 
19catch(e){
20  console.error(e.name)           //CustomError_MyError
21  console.error(e.description)    //Custom Error
22  console.error(e.message)        //Some Error Occurred
23  console.error(e.stack)          //stacktrace
24}

1new EvalError([message[, fileName[, lineNumber]]])

1try{
2  throw new EvalError('Eval Error Occurred');
3} 
4catch(e){
5  console.log(e instanceof EvalError); // true
6  console.log(e.message);    // "Eval Error Occurred"
7  console.log(e.name);       // "EvalError"
8  console.log(e.stack);      // "EvalError: Eval Error Occurred..."
9}

1new RangeError([message[, fileName[, lineNumber]]])

1// Uncaught RangeError: The normalization form should be one of NFC, NFD, NFKC, NFKD
2
3String.prototype.normalize(“-1”)

1// RangeError: Invalid array length
2var arr = new Array(-1);

1// Uncaught RangeError: toExponential() argument must be between 0 and 100
2Number.prototype.toExponential(101)
3// Uncaught RangeError: toFixed() digits argument must be between 0 and 100
4Number.prototype.toFixed(-1)
5// Uncaught RangeError: toPrecision() argument must be between 1 and 100
6Number.prototype.toPrecision(101)

1function checkRange(n)
2{
3    if( !(n >= 0 && n <= 100) )
4    {
5        throw new RangeError("The argument must be between 0 and 100.");
6    }
7};
8try
9{
10    checkRange(101);
11}
12catch(error)
13{
14    if (error instanceof RangeError)
15    {
16        console.log(error.name);
17        console.log(error.message);
18    }
19}

1function checkJusticeLeaque(value)
2{
3    if(["batman", "superman", "flash"].includes(value) === false)
4    {
5        throw new RangeError('The hero must be in Justice Leaque...');
6    }
7}
8try
9{
10    checkJusticeLeaque("wolverine");
11}
12catch(error)
13{
14    if(error instanceof RangeError)
15    {
16        console.log(error.name);
17        console.log(error.message);
18    }
19}

1new ReferenceError([message[, fileName[, lineNumber]]])

1try {
2  callJusticeLeaque();
3} 
4catch(e){
5  console.log(e instanceof ReferenceError)  // true
6  console.log(e.message)        // callJusticeLeaque is not defined
7  console.log(e.name)           // "ReferenceError"
8  console.log(e.stack)          // ReferenceError: callJusticeLeaque is not defined..
9}
10or as simple as 
11a/10;

1try {
2  throw new ReferenceError('Reference Error Occurred')
3} 
4catch(e){
5  console.log(e instanceof ReferenceError)  // true
6  console.log(e.message) // Reference Error Occurred
7  console.log(e.name)   // "ReferenceError"
8  console.log(e.stack)  // ReferenceError: Reference Error Occurred.
9}

1new SyntaxError([message[, fileName[, lineNumber]]])

1try {
2  eval('Justice Leaque');  
3} 
4catch(e){
5  console.error(e instanceof SyntaxError);  // true
6  console.error(e.message);    //  Unexpected identifier
7  console.error(e.name);       // SyntaxError
8  console.error(e.stack);      // SyntaxError: Unexpected identifier
9}
10Or as simple as 
11let a = 100/; // Uncaught SyntaxError: Unexpected token ';'
12// Uncaught SyntaxError: Unexpected token ] in JSON
13JSON.parse('[1, 2, 3, 4,]'); 
14// Uncaught SyntaxError: Unexpected token } in JSON
15JSON.parse('{"aa": 11,}');

1try {
2  throw new SyntaxError('Syntax Error Occurred');
3} 
4catch(e){
5  console.error(e instanceof SyntaxError); // true
6  console.error(e.message);    // Syntax Error Occurred
7  console.error(e.name);       // SyntaxError
8  console.error(e.stack);      // SyntaxError: Syntax Error Occurred
9}

1new TypeError([message[, fileName[, lineNumber]]])

1const a = 10;
2a = "string"; // Uncaught TypeError: Assignment to constant variable

1null.name // Uncaught TypeError: Cannot read property 'name' of null

1try {
2  var num = 1;
3  num.toUpperCase();
4} 
5catch(e){
6  console.log(e instanceof TypeError)  // true
7  console.log(e.message)   // num.toUpperCase is not a function
8  console.log(e.name)      // "TypeError"
9  console.log(e.stack)     // TypeError: num.toUpperCase is not a function
10}

1try {
2  throw new TypeError('TypeError Occurred') 
3} 
4catch(e){
5  console.log(e instanceof TypeError)  // true
6  console.log(e.message)          // TypeError Occurred
7  console.log(e.name)             // TypeError
8  console.log(e.stack)            // TypeError: TypeError Occurred
9}

1new URIError([message[, fileName[, lineNumber]]])

1// "https%3A%2F%2Fmedium.com%2F"
2encodeURIComponent('https://medium.com/');

1// https://medium.com/
2decodeURIComponent("https%3A%2F%2Fmedium.com%2F")

1try {
2  decodeURIComponent('%')
3} 
4catch (e) {
5  console.log(e instanceof URIError)  // true
6  console.log(e.message)              // URI malformed
7  console.log(e.name)                 // URIError
8  console.log(e.stack)                // URIError: URI malformed...
9}

1try {
2  throw new URIError('URIError Occurred')
3} 
4catch (e) {
5  console.log(e instanceof URIError)  // true
6  console.log(e.message)        // URIError Occurred
7  console.log(e.name)           // "URIError"
8  console.log(e.stack)          // URIError: URIError Occurred....
9}