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1. Top results related to what is the definition of adapt dictionary in javascript

   • What is the definition of strict equality (===) in Javascript?

     Top Answer

     Answered Oct 06, 2015 · 2 votes

     From the ES6 specification, 7.2.13 Strict Equality Comparison:

     Pretty much the same in the ES 5.1 specification here. The only thing that ES 5.1 leaves out is the part about Symbol values in step 7 since that is something that was added in ES6.

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     1/5

   • What is the definition of a read-only property in JavaScript? What does it mean?

     Top Answer

     Answered Jan 01, 2021 · 6 votes

     A read-only property means it cannot be overwritten or assigned to. Any such assignment will silently do nothing in non-strict mode. E.g.:

     var obj = {};Object.defineProperty(obj, 'property', {value: 123, writeable: false})--// Assign 456 to obj.property using the . syntax, but it's still 123obj.property = 456;console.log(obj.property);// Assign 789 to obj.property using the [] syntax, but it's still 123obj['property'] = 789;console.log(obj['property']);

     Or just error out with a TypeError in strict mide:

     'use strict';-var obj = {};Object.defineProperty(obj, 'property', {value: 123, writeable: false})// Assign 456 to obj.property in strict mode will result in a TypeErrorobj.property = 456;console.log(obj.property);

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     2/5

   • What is the precise definition of variable scope (in JavaScript)?

     Top Answer

     Answered Feb 10, 2021 · 3 votes

     Disclaimer: what follows is an explanation in my own words. I'm pretty confident about the concepts, but take the specific terms with a grain of salt: it could be that the specification or some other developer uses different terms.

     In JavaScript the "scope" that people tend to refer to is the so called "lexical scoping" of functions.

     IMHO it's best to think about scoping not from the point of view of a defined variable (or constant), but from the PoV of each line of code.

     E.g.:

     let a = 'foo';function bar(param) { param += 2; function newFunc() { for(let i = 0; i < 10; i++) { let v = 5; // what variables are "in scope" in this line? } } newFunc(); }

     JavaScript uses lexical scoping, that is: it doesn't matter when or how you call some code, what is accessible to the code itself is defined by the structure of the code itself (i.e., by the nesting of the brackets).

     It's very simple: for a certain statement, you just look at every code block that contains the statement. In the commented line above, the code can access to many variables:

     • v
     • i
     • param
     • a
     • everything in the global scope

     Albeit the structure of the code defines what is accessible by every statement, the lifetime of each variable is determined by the lifetime of the code using it. In other words, a variable whose lifetime (I'm using this term instead of scope, because I think it better describes the relevant part) would be terminated by, say, the end of a function block, can be "captured" by some other function, and end up in the execution scope of the latter. This is the concept of closure, and the source of many interesting techniques.

     So, I would say that:

     • the lexical scope of a block of code includes every surrounding "structure" (code block,function, class or module boundary).
     • a variable is "in scope" to every line that can "see" it via lexical scoping.

     A variable lifetime begins when it's corresponding var, let or const

     declaration is executed, and ends when there is no code that keeps it "alive", either directly or via a closure.

     I'm pretty sure that many extra details could be added, specifying the old var statement, with it's functional scoping, and comparing it with let and const block scoping, but this answer seems already pretty long :D

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     3/5

   • What is the definition of "parent component" in React?

     Top Answer

     Answered Mar 25, 2022 · 3 votes

     What is the definition of parent component

     React is a tool to detect changes and perform manipulations in the DOM, which in turn is basically a tree. React components and JSX are syntatic sugar to call DOM's APIs.

     eg

     ReactDOM.render( React.createElement('div', null, 'Hello World'), document.getElementById('root'));

     Is just as valid as passing a Component as the first argument.

     • A component represents an actual element of the DOM
     • A DOM's element can be understood as a node in a tree

     So a parent component/node can be defined as:

     the node which is a predecessor of any node is called as PARENT NODE. In simple words, the node which has a branch from it to any other node is called a parent node. Parent node can also be defined as "The node which has child / children".

     Is A parent of C

     No. A is a parent node by definition but not C's parent. For all purposes A is grandparent of C cause it is it's predecessor but not it's PARENT (directly predecessor).

     A is parent of B which is parent of C.

     If you would access C in the DOM the following is a valid statement:

     A.parentNode.parentNode-

     Is B a parent of C

     Yes!

     B gets the element of C via children prop. If C is the child of B, then B supposed to be the parent of C. But that should actually be a containment as mentioned in here.

     That's exactly it. Everything passed inside a components instantiation is mapped to a special prop name children. A containment is just a fancy way of saying that a component can receive arbitrary children from it's parents and still be able to access it.

     const Parent = () => <Child> Arbitrary value or node </Child>;-const Child = ({ children }) => <p> {children} </p>;

     children represents everything that was passed inside the component's tag.

     Other Answers

     Answered Mar 19, 2022 · 2 votes

     At least within the react docs, there is no exclusive definition of the terms parent/child component, but one can derive a definition from the usage of those terms in the docs, which might be opinionated.

     So my definition would be: In the hierarchy tree, every component that is above the component in question, has an ancestor relation to that component, and thus is a parent component. Everything below can serve as a direct or indirect child.

     Furthermore, direct parent components may pass information through props to its direct children and through context to its direct and indirect children. Children components may receive information from parent components accordingly.

     Therefore:

     Is A the parent of C?-

     yes (I would say a direct parent, but this can be disputed. Since A can pass props to C, but in the hierarchy tree, C would sit below B. A > B > C)

     Is B the parent of C?-

     yes, direct parent. Tough it is a containment, still, B may provide direct props to C by a function call within B children(<propsForCFromB>)

     Other Answers

     Answered Mar 22, 2022 · 2 votes

     "Containment" is just a concept in React where parents receive their children dynamically at runtime (as opposed to being pre-defined). In other words, containment is a special case of a parent-child relationship.

     The first sentence of the section on containment you linked says, "Some components don’t know their children ahead of time" and then shows an example of a component named FancyBorder receiving arbitrary children via {props.children}. The existence of children implies that something is its parent, which in this case is FancyBorder.

     I'm not sure if there are ironclad definitions of "parent" in React. "Parent" is a generic computer science term used to refer to something immediately above another in a hierarchy. For example, "C:\Program Files\Microsoft Office" is the parent directory of "C:\Program Files\Microsoft Office\Word".

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   • What is the use of the Array.of() method in JavaScript ?

     The JavaScript array.of() method is an inbuilt method in JavaScript that creates a new array instance with variables present as the argument of the method.

     Example: Here, Array.of() method is used to create new array instances with a variable number of arguments.

     Javascript

     // Here the Array.of() method creates a new Array instance with // a variable number of arguments, regardless of// number or type of the arguments.console.log(Array.of(0, 0, 0));console.log(Array.of(11, 21, 33));console.log(Array.of("Ram", "Geeta"));console.log(Array.of('geeksforgeeks'));console.log(Array.of(2, 3, 4, 'Sheeta'));

     Output

     [ 0, 0, 0 ][ 11, 21, 33 ][ 'Ram', 'Geeta' ][ 'geeksforgeeks' ][ 2, 3, 4, 'Sheeta' ]

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2. www.makeuseof.com › javascript-dictionaries-create-useJavaScript Basics: How to Create and Use a Dictionary - MUO

   www.makeuseof.com › javascript-dictionaries-create-use

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   Dec 20, 2022 · There is no "dictionary" keyword that you can use to create a dictionary object in JavaScript. However, you can create a dictionary using a generic object. Here's an example of how you can create an empty dictionary using the "Object" keyword: let dictionary = new Object (); You can also create an empty dictionary using this shorthand syntax ...

   • Occupation: Author

3. frontendstuff.com › demystifying-javascriptJavaScript Dictionaries: Simple guide with examples.

   frontendstuff.com › demystifying-javascript

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   Mar 26, 2024 · JavaScript dictionaries, also known as JavaScript objects or associative arrays, provide a powerful way to store and manipulate data in key-value pairs. Understanding how dictionaries work is essential for mastering JavaScript and building efficient and dynamic web applications.

4. stackoverflow.com › questions › 7196212How to create a dictionary and add key value pairs ...

   stackoverflow.com › questions › 7196212

   • Cached

   Except for it is a list, not a dictionary :\ I think the data is better represented as a list of "pairs" as well, like list = [["key1","value1"],["key2","value2"]]. Some other languages have a "pair", or "tuple" type. tldr for actual dict adding: dict['key'] = "value". – Jordan Stewart. Mar 19, 2020 at 11:36.

   Code sample

   var dict = {};

   dict.some invalid key (for multiple reasons) = "value1";

   dict["some invalid key (for multiple reasons)"] = "value1";...

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5. flexiple.com › javascript › javascript-dictionaryHow to create a JavaScript Dictionary? - Flexiple

   flexiple.com › javascript › javascript-dictionary

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   Mar 11, 2022 · Table of Contents - JavaScript Dictionary. Are there dictionaries in JavaScript? Creating a Dictionary. Adding & Deleting values. Limitations and Caveats - JavaScript Dictionary. Are there dictionaries in JavaScript? No, as of now JavaScript does not include a native “Dictionary” data type.

6. dev.to › opeyemi2018 › how-i-built-a-dictionaryHow i Built a Dictionary Using JavaScript - DEV Community

   dev.to › opeyemi2018 › how-i-built-a-dictionary

   • Cached

   Mar 25, 2024 · Opeyemi Odunayo. Posted on Mar 25. How i Built a Dictionary Using JavaScript. Features: 1 Dictionary Lookup: Users can search for the definitions of words using the built-in dictionary feature. 2 Text-to-Speech: One of the standout features of Voice Dictionary is its text-to-speech functionality.

7. www.thetechedvocate.org › javascript-basics-how-toJavaScript Basics: How to Create and Use a Dictionary

   www.thetechedvocate.org › javascript-basics-how-to

   • Cached

   May 28, 2024 · A dictionary is simply an object that allows you to store and access key-value pairs of data. In this article, we will be covering how to create and use a dictionary in JavaScript, and the basic methods you can use to manipulate its data. Creating a Dictionary.

8. People also ask

   How to create a dictionary object in JavaScript?

   • There is no "dictionary" keyword that you can use to create a dictionary object in JavaScript. However, you can create a dictionary using a generic object. Here's an example of how you can create an empty dictionary using the "Object" keyword: You can also create an empty dictionary using this shorthand syntax:

   JavaScript Basics: How to Create and Use a Dictionary - MUO

   www.makeuseof.com/javascript-dictionaries-create-use/

   See all results for this question

   How to create a dictionary?

   • Dictionaries are commonly used as each value stored has a unique key, and through these keys, their respective values can be accessed. This allows a lot of flexibility while reading and storing data. A dictionary can be created using two methods. The Object Literal method or by using the new keyword. However, we focus on the former.

   How to create a JavaScript Dictionary? - Flexiple

   flexiple.com/javascript/javascript-dictionary

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   What is a dictionary in Java?

   • A dictionary is a data structure that you can use to store data in your application. You can store data using a key-value pair, which allows you to look up and retrieve a specific value. Once you have stored data in a dictionary, you can complete other actions such as iterating over each item.

   JavaScript Basics: How to Create and Use a Dictionary - MUO

   www.makeuseof.com/javascript-dictionaries-create-use/

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   How to initialize a dictionary in JavaScript?

   • array[key] = iterateDict[key][reduceKey]; In case if someone needs to create a dictionary object dynamically you can use the following code snippet dict[varItem.key] = varItem.value }) You can initialize the dictionary like "key1": "Search", "key2": "View" And access it like

   How to create a dictionary and add key value pairs dynamically in

   stackoverflow.com/questions/7196212/how-to-create-a-dictionary-and-add-key-value-pairs-dynamically-in-javascript

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9. stackoverflow.com › questions › 16280058Preferred way of creating "dictionary of dictionaries" in ...

   stackoverflow.com › questions › 16280058

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   Apr 29, 2013 · 3 Answers. Sorted by: 2. An option is to build the object dynamically, like: var vals = [1, 2, 3, 4]; function createObject (arr) { var obj = {}; var mod = obj; for (var i = 0, j = arr.length; i < j; i++) { if (i === (j - 1)) { mod.value = arr [i]; } else { mod [arr [i]] = {}; mod = mod [arr [i]]; } } return obj; } console.log (createObject ...