The "=>" symbol is used in JavaScript to define arrow functions. An arrow function is a shorthand for writing anonymous functions (functions without a name) in JavaScript. Arrow functions provide a more concise syntax compared to regular function expressions and do not have their own "this", ...
In JavaScript, null is a primitive value that represents the intentional absence of any object value. It's often used to indicate that a variable or property intentionally holds no value or that an object reference points to nothing. null is a distinct value from undefined and has its own ...
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The JavaScript void operator evaluates the given expression and then returns a value of undefined. You may ocassionally encounter an HTML document that uses href="JavaScript:Void(0);" within an <a> element.JavaScript void is often used when, inserting an expression into a web page may produce...
Strict mode changes some previously-accepted mistakes into errors. JavaScript was designed to be easy for novice developers, and sometimes it gives operations which should be errors non-error semantics. Sometimes this fixes the immediate problem, but sometimes this creates worse problems in the future...
Use javascript: void(0) Example In this example, we have set javascript: void(0) to the href and added a double-click event to the anchor tag. Only when the user doubles clicks on the tag, does the alert trigger. Here page does not refresh because we have set javascript: void(0)....
“Nothing” in programming is returned when there is no result to return. What does “javascript:void(0)” mean? What is the use of void 0? What does “javascript:void(0)” mean? The undefined value is returned when evaluating an expression with the void operator. Generally, this ...
What does the ? in the ts type mean? // https://github.com/vuejs/vue/blob/dev/src/core/observer/watcher.js before: ?Function; options?: ?Object, This is a concept in the interface of ts. The interface of ts is "duck typing" or "structural subtyping", and type checking mainly foc...
4. What is Vanilla JavaScript?As you dig into JavaScript you’ll eventually hear the term “vanilla Javascript.” So what does that mean?Vanilla JavaScript is the JavaScript language “as is” without using any tools to make the coding process easier or more efficient....
vargreet='Hello'functionsayHello(){// not in strict mode'use strict'console.log(this)console.log(this.greet)}sayHello()// undefined// TypeError: Cannot read property 'greet' of undefined JavaScript In the example above, the content of our function is running in strict mode, so the global ...