# Individual exception catching in promises in JavaScript

In `then`, you can specify only handler function of an exception by passing `null` instead of the first parameter:

`promise.then( null, function(error) { console.log(error); } );`

In this case, it is convenient to use a shortened syntax using the `catch` method:

`promise.catch( function(error) { console.log(error); } );`

Rewrite the following code via the `catch` method:

`let promise = new Promise(function(resolve, reject) { setTimeout(function() { let isError = false; if (!isError) { resolve('success'); } else { reject(new Error('error')); } }, 3000); }); promise.then( res => console.log(res), err => console.log(err.message), );`
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