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try { // Code that might throw an error } catch (error) { console.error(error.message); }

In JavaScript, null represents the intentional absence of any object value, whereas undefined indicates a variable that has been declared but not assigned a value. cisco javascript essentials 2 answers exclusive

A promise in JavaScript represents a value that may not be available yet, but will be resolved at some point in the future. You can create a promise using the Promise constructor and handle its resolution or rejection using .then() and .catch() methods. For example: try { // Code that might throw an

const promise = new Promise((resolve, reject) => { // Asynchronous operation setTimeout(() => { resolve("Data loaded successfully."); }, 2000); }); For example: const promise = new Promise((resolve, reject)

Dog.prototype.sound = function() { console.log("The dog barks."); };

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