id stringlengths 16 145 | text stringlengths 1 179k | title stringclasses 1
value |
|---|---|---|
Mmdn_built_in_objects/Mmdn_built_in_objects_59_4.txt | ]: Deprecated. Not for use in new websites.
| |
Mmdn_built_in_objects/Mmdn_built_in_objects_19_4.txt |
// return true inventory stock is low
function isNotEnough(item) {
return item.quantity < 2;
}
console.log(inventory.findLast(isNotEnough));
// { name: "fish", quantity: 1 }
#### Using arrow function and destructuring
The previous example might be written using an arrow function ... | |
Mmdn_built_in_objects/Mmdn_built_in_objects_69_2.txt | ject ` ; a typical object inherits properties
(including methods) from ` Object.prototype ` , although these properties may
be shadowed (a.k.a. overridden). The only objects that don't inherit from `
Object.prototype ` are those with ` null ` prototype , or descended from
other ` null ` prototype objects.
Changes to... | |
Mmdn_built_in_objects/Mmdn_built_in_objects_5_1.txt | opyWithin)
5. [ ` Array.prototype.entries() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/entries)
6. [ ` Array.prototype.every() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/every)
7. [ ` Array.prototype.fill() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/f... | |
Mmdn_built_in_objects/Mmdn_built_in_objects_47_2.txt | d â which include the value of ` this ` and the first few
arguments â as its internal state. These values are stored in advance,
instead of being passed at call time. You can generally see ` const boundFn =
fn.bind(thisArg, arg1, arg2) ` as being equivalent to ` const boundFn =
(...restArgs) => fn.call(thisArg, arg... | |
Mmdn_built_in_objects/Mmdn_built_in_objects_75_2.txt | ng)
19. [ Fundamental CSS comprehension ](/en-US/docs/Learn/CSS/Building_blocks/Fundamental_CSS_comprehension)
20. [ Creating fancy letterheaded paper ](/en-US/docs/Learn/CSS/Building_blocks/Creating_fancy_letterheaded_paper)
21. [ A cool-looking box ](/en-US/docs/Learn/CSS/Building_blocks/A_cool_looking_bo... | |
Mmdn_built_in_objects/4usesofjavascriptsar_74_0.txt | * [ Talk to an expert ](/company/contact/sales?referrer=mainmenu/partners) | |
Mmdn_built_in_objects/Mmdn_built_in_objects_25_1.txt | tries() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/entries)
6. [ ` Array.prototype.every() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/every)
7. [ ` Array.prototype.fill() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/fill)
8. [ ` Array.prototype.filter()... | |
Mmdn_built_in_objects/jsmapsasp_379_0.txt | The ` set() ` method can also be used to change existing Map values: | |
Mmdn_built_in_objects/Mmdn_built_in_objects_87_6.txt | name>...) ](/en-US/docs/Web/JavaScript/Reference/Regular_expressions/Named_capturing_group)
14. [ Non-capturing group: (?:...) ](/en-US/docs/Web/JavaScript/Reference/Regular_expressions/Non-capturing_group)
15. [ Quantifier: *, +, ?, {n}, {n,}, {n,m} ](/en-US/docs/Web/JavaScript/Reference/Regular_expressions/Qu... | |
Mmdn_built_in_objects/jsmapsasp_165_0.txt | [ Django ](/django/django_exercises.php "Django Exercises") [ Exercise
](/django/django_exercises.php "Django Exercises") [ Quiz
](/django/django_quiz.php "Django Quizzes") | |
Mmdn_built_in_objects/jsmapsasp_172_0.txt | ### Data Analytics | |
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Mmdn_built_in_objects/Mmdn_built_in_objects_48_1.txt | otype.entries() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/entries)
6. [ ` Array.prototype.every() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/every)
7. [ ` Array.prototype.fill() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/fill)
8. [ ` Array.prototype.... | |
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Mmdn_built_in_objects/322323_10_0.txt |
It spits out a syntax error. Can someone explain the reason for this? | |
Mmdn_built_in_objects/322323_28_0.txt | // the above is the same as the below
x => x/2 | |
Mmdn_built_in_objects/javascriptmapmethod_56_0.txt | ## Conclusion | |
Mmdn_built_in_objects/jsmapsasp_412_0.txt | ES6 is fully supported in all modern browsers since June 2017: | |
Mmdn_built_in_objects/Mmdn_built_in_objects_100_4.txt | s = Array(5).fill("girl", 0);
Note that the array was initially a [ sparse array ](/en-
US/docs/Web/JavaScript/Guide/Indexed_collections#sparse_arrays) with no
assigned indices. ` fill() ` is still able to fill this array.
### Calling fill() on non-array objects
The ` fill() ` method reads the ` length ` prope... | |
Mmdn_built_in_objects/Mmdn_built_in_objects_43_3.txt | er the passed value
is an [ ` Array ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array)
.
## Try it
## Syntax
js
Array.isArray(value)
### Parameters
` value `
The value to be checked.
### Return value
` true ` if ` value ` is an [ ` Array ` ](/en-
US/docs/Web/JavaScript/... | |
Mmdn_built_in_objects/Mmdn_built_in_objects_50_1.txt | tures/offline) .
## Why are we working on premium features on MDN?
The extensive research we have done in 2020 and 2021 showed us that MDN users
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Mmdn_built_in_objects/Mmdn_built_in_objects_103_5.txt | value returned by ` reduce() ` in this case would be ` 95 ` .
### Sum of values in an object array
To sum up the values contained in an array of objects, you **must** supply an
` initialValue ` , so that each item passes through your function.
js
const objects = [{ x: 1 }, { x: 2 }, { x: 3 }];
co... | |
Mmdn_built_in_objects/4usesofjavascriptsar_11_0.txt | Backups & Snapshots | |
Mmdn_built_in_objects/Mmdn_built_in_objects_67_3.txt | ray ` ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/Array) instances reverses an
array _[ in place ](https://en.wikipedia.org/wiki/In-place_algorithm) _ and
returns the reference to the same array, the first array element now becoming
the last, and the last array element becoming the first. In other words,
ele... | |
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Mmdn_built_in_objects/Mmdn_built_in_objects_95_5.txt | pation Guidelines ](https://www.mozilla.org/about/governance/policies/participation/)
Visit [ Mozilla Corporationâs ](https://www.mozilla.org) not-for-profit
parent, the [ Mozilla Foundation ](https://foundation.mozilla.org/) .
Portions of this content are ©1998â 2024 by individual mozilla.org
contributors.... | |
Mmdn_built_in_objects/4usesofjavascriptsar_108_0.txt | From the classic ` for ` loop to the ` forEach() ` method, various techniques
and methods are used to iterate through datasets in [ JavaScript
](https://www.digitalocean.com/community/tutorial_series/how-to-code-in-
javascript) . One of the most popular methods is the ` .map() ` method. `
.map() ` creates an [ array
](... | |
Mmdn_built_in_objects/Mmdn_built_in_objects_37_8.txt | _web/CSS_basics) article is also covered
in our [ CSS first steps ](/en-US/docs/Learn/CSS/First_steps) module, albeit
in a lot more detail.
## Modules
This topic contains the following modules, in a suggested order for working
through them. You should start with the first one.
[ CSS first steps ](/en-US/docs/Learn/... | |
Mmdn_built_in_objects/Mmdn_built_in_objects_10_1.txt | e.entries() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/entries)
6. _[ ` Array.prototype.every() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/every) _
7. [ ` Array.prototype.fill() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/fill)
8. [ ` Array.prototype.f... | |
Mmdn_built_in_objects/4usesofjavascriptsar_149_0.txt | const names = ["whale", "squid", "turtle", "coral", "starfish"]; | |
Mmdn_built_in_objects/Mmdn_built_in_objects_58_2.txt | itHub ](https://github.com/mdn/)
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Mmdn_built_in_objects/Mmdn_built_in_objects_26_3.txt | g a layout with
container queries.
[ Read more â ](./getting-started-with-css-container-queries/) [  [ Next ❯ ](js_map_methods.asp) | |
Mmdn_built_in_objects/4usesofjavascriptsar_208_0.txt |  | |
Mmdn_built_in_objects/jsmapsasp_29_0.txt | [ Learn AI ](/ai/default.asp "Artificial Intelligence Tutorial") [ Tutorial
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course "Paid NumPy Course") | |
Mmdn_built_in_objects/Mmdn_built_in_objects_72_1.txt | ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/entries)
6. [ ` Array.prototype.every() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/every)
7. [ ` Array.prototype.fill() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/fill)
8. [ ` Array.prototype.filter() ` ](/en-U... | |
Mmdn_built_in_objects/jsmapsasp_82_0.txt | ### Backend | |
Mmdn_built_in_objects/Mmdn_built_in_objects_70_6.txt | ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/Array/flatMap) , [ ` map() `
](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map) , [ ` slice()
` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/slice) , and [ `
splice() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/splice)... | |
Mmdn_built_in_objects/Mmdn_built_in_objects_91_6.txt | erence%2Fglobal_objects%2Farray%2Freduceright%60%0A*+MDN+URL%3A+https%3A%2F%2Fdeveloper.mozilla.org%2Fen-
US%2Fdocs%2FWeb%2FJavaScript%2FReference%2FGlobal_Objects%2FArray%2FreduceRight%0A*+GitHub+URL%3A+https%3A%2F%2Fgithub.com%2Fmdn%2Fcontent%2Fblob%2Fmain%2Ffiles%2Fen-
us%2Fweb%2Fjavascript%2Freference%2Fglobal_obje... | |
Mmdn_built_in_objects/Mmdn_built_in_objects_37_1.txt | ML/Introduction_to_HTML/Creating_hyperlinks)
6. [ Advanced text formatting ](/en-US/docs/Learn/HTML/Introduction_to_HTML/Advanced_text_formatting)
7. [ Document and website structure ](/en-US/docs/Learn/HTML/Introduction_to_HTML/Document_and_website_structure)
8. [ Debugging HTML ](/en-US/docs/Learn/HTML/In... | |
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Mmdn_built_in_objects/Mmdn_built_in_objects_23_1.txt | aScript/Reference/Global_Objects/Object/__lookupSetter__) Deprecated
5. [ ` Object.assign() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign)
6. [ ` Object.create() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/create)
7. [ ` Object.defineProperties() ` ](/en-US/docs/W... | |
Mmdn_built_in_objects/jsmapsasp_170_0.txt | [ MongoDB ](/mongodb/mongodb_exercises.php "MongoDB Exercises") [ Exercise
](/mongodb/mongodb_exercises.php "MongoDB Exercises") | |
Mmdn_built_in_objects/Mmdn_built_in_objects_76_6.txt | ier: *, +, ?, {n}, {n,}, {n,m} ](/en-US/docs/Web/JavaScript/Reference/Regular_expressions/Quantifier)
16. [ Unicode character class escape: \p{...}, \P{...} ](/en-US/docs/Web/JavaScript/Reference/Regular_expressions/Unicode_character_class_escape)
17. [ Wildcard: . ](/en-US/docs/Web/JavaScript/Reference/Regular... | |
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Mmdn_built_in_objects/Mmdn_built_in_objects_107_2.txt |
## Description
If the function ` f ` was invoked by the top-level code, the value of `
f.caller ` is [ ` null ` ](/en-
US/docs/Web/JavaScript/Reference/Operators/null) ; otherwise it's the function
that called ` f ` . If the function that called ` f ` is a strict mode
function, the value of ` f.caller ` is also ` n... | |
Mmdn_built_in_objects/Mmdn_built_in_objects_22_2.txt | to gain different viewpoints and to converge on an agreed-upon course of action. This helps to keep issues focused and productive.
* After filing an issue, try to fix the problem yourself. Read our [ contribution guide ](https://github.com/mdn/content/blob/main/CONTRIBUTING.md) to learn more.
* If you have a ques... | |
Mmdn_built_in_objects/jsmapsasp_142_0.txt | ### Data Analytics | |
Mmdn_built_in_objects/javascriptmapmethod_9_0.txt | You can get all the source code from [ here
](https://github.com/dotslashbit/fcc-article-resources/blob/main/js-map-
method/index.js) . | |
Mmdn_built_in_objects/Mmdn_built_in_objects_21_1.txt | /docs/Web/JavaScript/Reference/Global_Objects/Array/entries)
6. [ ` Array.prototype.every() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/every)
7. [ ` Array.prototype.fill() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/fill)
8. [ ` Array.prototype.filter() ` ](/en-US/docs/W... | |
Mmdn_built_in_objects/jsmapsasp_352_0.txt | [ jQuery Selectors ](js_jquery_selectors.asp) [ jQuery HTML
](js_jquery_elements.asp) [ jQuery CSS ](js_jquery_css.asp) [ jQuery DOM
](js_jquery_dom.asp) | |
Mmdn_built_in_objects/Mmdn_built_in_objects_82_3.txt | S/docs/Web/JavaScript/Reference/Global_Objects/Date)
* [ ` RegExp ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp)
The [ ` arguments ` ](/en-
US/docs/Web/JavaScript/Reference/Functions/arguments) object returns `
"[object Arguments]" ` . Everything else, including user-defined classes,
unless with a c... | |
Mmdn_built_in_objects/Mmdn_built_in_objects_70_12.txt | shows how to access items in the ` fruits ` array by specifying
the index number of their position in the array.
js
const fruits = ["Apple", "Banana"];
// The index of an array's first element is always 0.
fruits[0]; // Apple
// The index of an array's second element is always 1.
... | |
Mmdn_built_in_objects/jsmapsasp_339_0.txt | ## JS Async | |
Mmdn_built_in_objects/Mmdn_built_in_objects_35_5.txt | tion-break ](/en-US/docs/Web/CSS/box-decoration-break)
3. [ box-direction ](/en-US/docs/Web/CSS/box-direction) Non-standard Deprecated
4. [ box-flex ](/en-US/docs/Web/CSS/box-flex) Non-standard Deprecated
5. [ box-flex-group ](/en-US/docs/Web/CSS/box-flex-group) Non-standard Deprecated
6. ... | |
Mmdn_built_in_objects/Mmdn_built_in_objects_33_1.txt | [@@hasInstance]() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/@@hasInstance)
2. [ ` Function.prototype.apply() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/apply)
3. [ ` Function.prototype.bind() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/bind)
... | |
Mmdn_built_in_objects/4usesofjavascriptsar_242_0.txt | ###### Contact | |
Mmdn_built_in_objects/4usesofjavascriptsar_126_0.txt | // call the function we made. more readable
const sweeterArray = sweetArray.map(makeSweeter); | |
Mmdn_built_in_objects/Mmdn_built_in_objects_13_6.txt | 378. [ Recursion ](/en-US/docs/Glossary/Recursion)
379. [ Reflow ](/en-US/docs/Glossary/Reflow)
380. [ Regular expression ](/en-US/docs/Glossary/Regular_expression)
381. [ Render-blocking ](/en-US/docs/Glossary/Render_blocking)
382. [ Rendering engine ](/en-US/docs/Glossary/Rendering_engine)
383. ... | |
Mmdn_built_in_objects/Mmdn_built_in_objects_65_2.txt | opertyDescriptor() ` ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyDescriptor)
API. This method's behavior is only specified for web compatibility, and is
not required to be implemented in any platform. It may not work everywhere.
The **` __lookupSetter__() ` ** method of [ ` Object ` ](/... | |
Mmdn_built_in_objects/jsmapsasp_97_0.txt | [ Learn ASP ](/asp/default.asp "ASP Tutorial") [ Tutorial ](/asp/default.asp
"ASP Tutorial") [ Reference ](/asp/asp_ref_vbscript_functions.asp "ASP
Reference") | |
Mmdn_built_in_objects/jsmapsasp_21_0.txt | [ Learn Colors ](/colors/default.asp "Colors Tutorial") [ Tutorial
](/colors/default.asp "Colors Tutorial") [ Reference
](/colors/colors_fs595.asp "Colors Reference") | |
Mmdn_built_in_objects/322323_27_0.txt | x => {
return x/2
} | |
Mmdn_built_in_objects/Mmdn_built_in_objects_107_4.txt | andard. Check cross-browser support before using.
*[
Deprecated
]: Deprecated. Not for use in new websites.
| |
Mmdn_built_in_objects/Mmdn_built_in_objects_6_0.txt | * Skip to main content
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Mmdn_built_in_objects/Mmdn_built_in_objects_55_2.txt | Symbol ` ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/Symbol) .
### Return value
A boolean value indicating whether the specified property is enumerable and is
the object's own property.
## Description
All objects that inherit from ` Object.prototype ` (that is, all except [ `
null ` -prototype objects... | |
Mmdn_built_in_objects/Mmdn_built_in_objects_16_5.txt | illa.org/) .
Portions of this content are ©1998â 2024 by individual mozilla.org
contributors. Content available under [ a Creative Commons license ](/en-
US/docs/MDN/Writing_guidelines/Attrib_copyright_license) .
*[
Non-standard
]: Non-standar... | |
Mmdn_built_in_objects/4usesofjavascriptsar_47_0.txt | [ See all solutions ](/business) | |
Mmdn_built_in_objects/4usesofjavascriptsar_96_0.txt | 6. [ | |
Mmdn_built_in_objects/jsmapsasp_189_0.txt | [ Data Analytics ](https://campus.w3schools.com/products/data-analytics-
program "Paid Data Analytics Course") [ Course
](https://campus.w3schools.com/products/data-analytics-program "Paid Data
Analytics Course") | |
Mmdn_built_in_objects/jsmapsasp_71_0.txt | [ Where To Start ](/where_to_start.asp "Where To Start - Web Development") | |
Mmdn_built_in_objects/javascriptmapmethod_18_0.txt |
* ` array ` : The original array that you want to iterate over.
* ` callback ` : A function that will be executed on each element of the array.
* ` currentValue ` : The current element being processed in the array.
* ` index ` (optional): The index of the current element being processed.
* ` array ` (optional): The ar... | |
Mmdn_built_in_objects/Mmdn_built_in_objects_47_4.txt |
class LateBloomer {
constructor() {
this.petalCount = Math.floor(Math.random() * 12) + 1;
}
bloom() {
// Declare bloom after a delay of 1 second
setTimeout(this.declare.bind(this), 1000);
}
declare() {
console.log(`I am a beautiful flower with ${this... | |
Mmdn_built_in_objects/jsmapsasp_52_0.txt | [ Code Editor ](/tryit/default.asp "Try it - Code Editor") | |
Mmdn_built_in_objects/Mmdn_built_in_objects_93_4.txt | saving it to a variable.
if (idx > 0 && num >= arr[idx - 1]) return false;
if (idx < arr.length - 1 && num >= arr[idx + 1]) return false;
return true;
});
console.log(lastTrough); // 6
### Using findLastIndex() on sparse arrays
You can search for ` undefined ` in a sparse array... | |
Mmdn_built_in_objects/Mmdn_built_in_objects_10_4.txt | rue;
return num > arr[idx - 1];
});
console.log(isIncreasing); // true
### Using every() on sparse arrays
` every() ` will not run its predicate on empty slots.
js
console.log([1, , 3].every((x) => x !== undefined)); // true
console.log([2, , 2].every((x) => x === 2)); // t... | |
Mmdn_built_in_objects/Mmdn_built_in_objects_48_3.txt | ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/toReversed) , do
not use ` @@species ` and always return a new ` Array ` base class instance.
## Syntax
js
Array[Symbol.species]
### Return value
The value of the constructor ( ` this ` ) on which ` get @@species ` was
called. The ret... | |
Mmdn_built_in_objects/javascriptmapmethod_10_0.txt | ## Table of Contents | |
Mmdn_built_in_objects/322323_12_0.txt | var rating = watchList.map(function(e){
title: e.Title,
rating: e.imdbRating
}); | |
Mmdn_built_in_objects/javascriptmapmethod_74_0.txt | You can [ make a tax-deductible donation here
](https://www.freecodecamp.org/donate/) . | |
Mmdn_built_in_objects/Mmdn_built_in_objects_66_0.txt | * Skip to main content
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* References [ References ](/en-US/docs/Web)
* [ Overview / Web Technology Web technology reference for developers ](/en-US/docs/Web)
* [ HTML Structure of content on the web ](/en-US/do... | |
Mmdn_built_in_objects/jsmapsasp_153_0.txt | [ Vue ](/vue/vue_exercises.php "Vue Exercises") [ Exercise
](/vue/vue_exercises.php "Vue Exercises") [ Quiz ](/vue/vue_quiz.php "Vue
Quizzes") | |
Mmdn_built_in_objects/4usesofjavascriptsar_118_0.txt | const sweetArray = [2, 3, 4, 5, 35]
const sweeterArray = sweetArray.map(sweetItem => {
return sweetItem * 2
}) | |
Mmdn_built_in_objects/Mmdn_built_in_objects_52_3.txt |
class Foo {
#value = "foo";
static getValue(x) {
return x.#value;
}
static isFoo(x) {
return #value in x;
}
}
const baz = { __proto__: Foo.prototype };
if (Foo.isFoo(baz)) {
// Doesn't run, because baz is not a Foo
console.lo... | |
Mmdn_built_in_objects/4usesofjavascriptsar_57_0.txt | Documentation | |
Mmdn_built_in_objects/Mmdn_built_in_objects_30_9.txt | n-US/about)
* [ Blog ](/en-US/blog/)
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## Our communit... | |
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