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1. Top results related to what is a set in javascript?

   • What is the best way to write if-then-else for a large data set in JavaScript?

     Top Answer

     Answered Apr 13, 2022 · 2 votes

     A nested object indexed by age, then indexed by lifestyle would work.

     const calorieData = { 2: { 1: 1000, 2: 2000, }, 3: { 1: 1000, 2: 2000, }};// ...const calories = calorieData[age][lifestyle];

     A DRY-er version would use arrays instead, but it could require slightly more confusing code due to 0-based indicies.

     const calorieData = [ // omit index 0 , // omit index 1 , [1000, 2000], [1000, 2000], // ...];// ...// because lifestyle is 1-indexedconst calories = calorieData[age][lifestyle - 1];

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   • What is a "REPL" in javascript?

     Top Answer

     Answered Jun 20, 2020 · 75 votes

     Good information in the repl tag right here on Stack Overflow:

     About read-eval-print-loop

     A Read-Eval-Print Loop (REPL) is an interactive interpreter to a programming language. It originated with LISP systems, but many other languages (Python, Ruby, Haskell, Tcl, etc.) use REPL's to manage interactive sessions. They allow for simple experimentation with a language by bypassing the compile stage of the "code -> compile -> execute" cycle.

     There are 4 components to a REPL (named in LISP notation):

     • A read function, which reads input from the keyboard
     • An eval function, which evaluates code passed to it
     • A print function, which formats and displays results
     • A loop function, which runs the three previous commands until termination

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     2/5

   • What is a node in Javascript?

     Top Answer

     Answered Jul 04, 2020 · 56 votes

     A "node", in this context, is simply an HTML element. The "DOM" is a tree structure that represents the HTML of the website, and every HTML element is a "node". See Document Object Model (DOM).

     More specifically, "Node" is an interface that is implemented by multiple other objects, including "document" and "element". All objects implementing the "Node" interface can be treated similarly. The term "node" therefore (in the DOM context) means any object that implements the "Node" interface. Most commonly that is an element object representing an HTML element.

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   • What is a receiver in JavaScript?

     Top Answer

     Answered Jun 01, 2016 · 38 votes

     The receiver is the object in which the property lookup happens.

     So yes, if you use a.jump, a is the receiver.

     The concept is only relevant when you can execute arbitrary code when that property lookup happens. Basically, that means:

     var target = { get getReceiver() { return this; }};target.getReceiver; // targetvar inherits = Object.create(target);inherits.getReceiver; // inherits

     var proxy = new Proxy({}, { get: function(target, property, receiver) { return receiver; }});proxy.getReceiver; // proxyvar inherits = Object.create(proxy);inherits.getReceiver; // inherits

     • Accessor properties.You can access the receiver by using this inside the getter or setter. The receiver will usually be the object in which you defined the property, or another object which inherits from it. var target = { get getReceiver() { return this; }};target.getReceiver; // targetvar inherits = Object.create(target);inherits.getReceiver; // inheritsA built-in example is __proto__ , defined as a property of Object.prototype but expected to be got or set on other objects (receivers).
     • Proxy objectsProxy objects allow you to define get or set traps, which run a function when you attempt to get or set any property to the proxy. The receiver is provided as an argument of that function. The receiver will usually the Proxy object itself, or an object which inherits from it. var proxy = new Proxy({}, { get: function(target, property, receiver) { return receiver; }});proxy.getReceiver; // proxyvar inherits = Object.create(proxy);inherits.getReceiver; // inherits

     Note you can use Reflect.get

     or Reflect.set

     to specify arbitrary receivers:

     Reflect.get(target, "getReceiver", arbitraryValue); // arbitraryValue ¹Reflect.get(proxy, "getReceiver", arbitraryValue); // arbitraryValue

     ¹ If the getter was defined in non-strict mode, it will be Object(arbitraryValue)

     .

     The name "receiver" comes from the specification, see Object Internal Methods and Internal Slots

     • [[Get]]   (propertyKey, Receiver) → anyReturn the value of the property whose key is propertyKey from this object. If any ECMAScript code must be executed to retrieve the property value, Receiver is used as the this value when evaluating the code.
     • [[Set]]   (propertyKey, value, Receiver) → BooleanSet the value of the property whose key is propertyKey to value. If any ECMAScript code must be executed to set the property value, Receiver is used as the this value when evaluating the code. Returns true if the property value was set or false if it could not be set.

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   • What is a String in JavaScript ?

     In JavaScript, a string is a data type used to represent a sequence of characters. Strings are typically used to store and manipulate text-based data. Strings can contain letters, numbers, symbols, and whitespace characters.

     Example: Here, the variable greeting is assigned a string value "Hello, world!", which represents a common greeting message. The string is enclosed within double quotes ("), indicating its beginning and end.

     Javascript

     let greeting = "Hello, world!";console.log(greeting); // Output: Hello, world!-

     Output

     Hello, world!-

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     5/5

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2. www.geeksforgeeks.org › sets-in-javascriptSets in JavaScript - GeeksforGeeks

   www.geeksforgeeks.org › sets-in-javascript

   • Cached

   May 30, 2024 · Sets in JavaScript are collections of unique values, meaning no duplicates are allowed. They provide efficient ways to store and manage distinct elements. Sets support operations like adding, deleting, and checking the presence of items, enhancing performance for tasks requiring uniqueness.

   • How to sort a set in JavaScript - GeeksforGeeks

     Sorting a Set based on the values of its elements is a...

   • How to iterate over Set elements in JavaScript - GeeksforGeeks

     In JavaScript, you can iterate over the elements of a Set...

3. www.naukri.com › code360 › librarySets in Javascript - Naukri Code 360

   www.naukri.com › code360 › library

   • Cached

   May 25, 2024 · Sets are a powerful data structure in JavaScript that allow you to store unique values of any type, whether primitive values or object references. They provide a convenient way to keep track of distinct elements without duplicates, making them useful for tasks like removing duplicate values from an array or quickly checking if an element exists.

4. www.freecodecamp.org › news › how-to-create-objectsHow to Create Objects in JavaScript - freeCodeCamp.org

   www.freecodecamp.org › news › how-to-create-objects

   • Cached

   May 10, 2024 · Best Practices for Object Creation in JavaScript 1. Use Object Literals for Simple Structures. For simple data structures with a fixed set of properties, use object literals. They provide a concise syntax for defining objects. 2. Prefer Constructor Functions or Classes for Complex Objects

5. javascript.infoThe Modern JavaScript Tutorial

   javascript.info

   • Cached

   2 days ago · Unicode: flag "u" and class \p {...} Sets and ranges [...] Modern JavaScript Tutorial: simple, but detailed explanations with examples and tasks, including: closures, document and events, object oriented programming and more.

6. stackoverflow.com › questions › 78559293v8 - Javascript Set creation performance - Stack Overflow

   stackoverflow.com › questions › 78559293

   • Cached

   6 days ago · For large arrays (i.e. 1M elements), is it faster to create and iterate over a Set (from an Array) than an Array - if you just need a single or two iterations to occur ever and performance is the only requirement (no need for deduping the array etc)? Consider the following two scenarios for illustration of what I mean:

7. People also ask

   What is a set in JavaScript?

   • The set can store any type of value whether primitive or objects. it: It is an iterable object whose all elements are added to the new set created, If the parameter is not specified or null is passed then a new set created is empty. A new set object. Example: This example shows the implementation of a JavaScript set.

   Sets in JavaScript - GeeksforGeeks

   www.geeksforgeeks.org/sets-in-javascript/

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   What is a set object in JavaScript?

   • As I hinted to earlier, the Set object is a JavaScript object that only holds unique values. These values, however, can be anything you want since it will support both primitive data types ( numbers, strings, boolean, undefined, symbol, bigint) and objects ( arrays, objects, functions ). A Set object can be created using the constructor Set ().

   Storing Unique Values with the Set Object in JavaScript

   javascript.plainenglish.io/storing-unique-values-with-set-object-in-javascript-ac2707dbdb6

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   What is new set in JavaScript?

   • So new Set(ages) is a Set containing all the values in ages, which duplicates necessarily removed. Then the spread operator just converts this back into an array - the overall effect being to just remove duplicates from the array. Related: What is the 'new' keyword in JavaScript?.

   How does [...new set(array)] work in JavaScript? - Stack Overflow

   stackoverflow.com/questions/63928416/how-does-new-setarray-work-in-javascript

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   What is a set value in JavaScript?

   • The Set.values () method in JavaScript returns a new Iterator object that contains all of the items available in the set in a certain order. The order of values are in the same order that they were inserted into the set. Syntax: Parameters: This method does not accept any parameters.

   JavaScript Set values() Method - GeeksforGeeks

   www.geeksforgeeks.org/javascript-set-values-method/

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