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

   • 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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     1/5

   • 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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     2/5

   • 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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     3/5

   • 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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     4/5

   • 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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     5/5

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2. developer.mozilla.org › en-US › docsSet - JavaScript | MDN - MDN Web Docs

   developer.mozilla.org › en-US › docs

   • Cached

   Jan 31, 2024 · The Set object lets you store unique values of any type, whether primitive values or object references. Description. Set objects are collections of values. A value in the set may only occur once; it is unique in the set's collection. You can iterate through the elements of a set in insertion order.

3. www.w3schools.com › js › js_setsJavaScript Sets - W3Schools

   www.w3schools.com › js › js_sets

   • Cached

   A JavaScript Set is a collection of unique values. Each value can only occur once in a Set. The values can be of any type, primitive values or objects. How to Create a Set. You can create a JavaScript Set by: Passing an array to new Set() Create an empty set and use add() to add values. The new Set () Method.

4. 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.

   • Video Duration: 6 min

5. www.geeksforgeeks.org › what-is-a-set-in-javascriptWhat is a Set in JavaScript? - GeeksforGeeks

   www.geeksforgeeks.org › what-is-a-set-in-javascript

   • Cached

   Jan 31, 2024 · In JavaScript, a Set is a built-in object that allows you to store unique values of any data type, whether primitive values or object references. Unlike arrays, which can contain duplicate values and are ordered by index, a Set only holds distinct values, and the order of insertion is maintained.

6. www.javascripttutorial.net › javascript-setThe Beginner's Guide to JavaScript Set Type in ES6

   www.javascripttutorial.net › javascript-set

   • Cached

   This tutorial introduces you to the JavaScript Set type and shows you how to manipulate the elements in the set effectively.

7. www.freecodecamp.org › news › how-to-use-javascriptHow to Use JavaScript Collections – Map and Set

   www.freecodecamp.org › news › how-to-use-javascript

   • Cached

   Oct 5, 2020 · How to Use JavaScript Collections – Map and Set. TAPAS ADHIKARY. In JavaScript, objects are used to store multiple values as a complex data structure. An object is created with curly braces {…} and a list of properties. A property is a key-value pair where the key must be a string and the value can be of any type.

8. 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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   How to create a set in JavaScript?

   • A JavaScript Set is a collection of unique values. Each value can only occur once in a Set. The values can be of any type, primitive values or objects. You can create a JavaScript Set by: Pass an array to the new Set() constructor: Create a Set and add values: Create a Set and add variables: If you add equal elements, only the first will be saved:

   JavaScript Sets - W3Schools

   www.w3schools.com/js/js_sets.asp

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   What is a set object?

   • The Set object lets you store unique values of any type, whether primitive values or object references. Set objects are collections of values. A value in the set may only occur once; it is unique in the set's collection. You can iterate through the elements of a set in insertion order.

   Set - JavaScript | MDN - MDN Web Docs

   developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set

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   What is a set object in JavaScript?

   • console .log(chars); // Set{} Code language: JavaScript (javascript) A Set object maintains the insertion order of its elements, therefore, when you iterate over its elements, the order of the elements is the same as the inserted order. Suppose you have a set of user roles as follows.

   The Beginner's Guide to JavaScript Set Type in ES6

   www.javascripttutorial.net/javascript-set/

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