id stringlengths 16 145 | text stringlengths 1 179k | title stringclasses 1
value |
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Mmdn_built_in_objects/jsmapsasp_359_0.txt | # JavaScript Maps | |
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Mmdn_built_in_objects/Mmdn_built_in_objects_17_2.txt | /JavaScript/Reference/Global_Objects/Array/values)
43. [ ` Array.prototype.with() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/with)
6. **Inheritance**
7. **[ ` Function ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function) **
8. Constructor
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Mmdn_built_in_objects/4usesofjavascriptsar_189_0.txt | Shouldnât this say âcreate a new arrayâ? I donât see how .map creates
a ânew functionâ. | |
Mmdn_built_in_objects/jsmapsasp_126_0.txt | [ Web Certificates ](https://campus.w3schools.com "Certificates") | |
Mmdn_built_in_objects/Mmdn_built_in_objects_3_3.txt | ray ` ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/Array) instances returns the
first index at which a given element can be found in the array, or -1 if it is
not present.
## Try it
## Syntax
js
indexOf(searchElement)
indexOf(searchElement, fromIndex)
### Parameters
` searchEle... | |
Mmdn_built_in_objects/Mmdn_built_in_objects_78_1.txt | omises ](/en-US/docs/Web/JavaScript/Guide/Using_promises)
15. [ JavaScript typed arrays ](/en-US/docs/Web/JavaScript/Guide/Typed_arrays)
16. [ Iterators and generators ](/en-US/docs/Web/JavaScript/Guide/Iterators_and_generators)
17. [ Meta programming ](/en-US/docs/Web/JavaScript/Guide/Meta_programming)
... | |
Mmdn_built_in_objects/jsmapsasp_378_0.txt | [ Try it Yourself » ](tryit.asp?filename=tryjs_map_set_new) | |
Mmdn_built_in_objects/javascriptmapmethod_28_0.txt | The ` map ` method iterates over each element of the array, applies the
provided callback function, and returns a new array ( ` doubledNumbers ` )
containing the doubled values. This approach simplifies the code and improves
readability. | |
Mmdn_built_in_objects/4usesofjavascriptsar_107_0.txt | ### Introduction to Javascript Maps | |
Mmdn_built_in_objects/Mmdn_built_in_objects_69_4.txt | iginal generic one back
console.log(nullProtoObj.toString()); // shows "[object Object]"
console.log(`nullProtoObj is: ${nullProtoObj}`); // shows "nullProtoObj is: [object Object]"
Unlike normal objects, in which ` toString() ` is on the object's prototype,
the ` toString() ` method here is an own p... | |
Mmdn_built_in_objects/4usesofjavascriptsar_159_0.txt | return container;
}) | |
Mmdn_built_in_objects/4usesofjavascriptsar_153_0.txt | ## How to Reformat JavaScript Array Objects | |
Mmdn_built_in_objects/Mmdn_built_in_objects_30_7.txt | o mini blog ](/en-US/docs/Learn/Server-side/Django/django_assessment_blog)
42. Express Web Framework (Node.js/JavaScript)
1. [ Express web framework (Node.js/JavaScript) ](/en-US/docs/Learn/Server-side/Express_Nodejs)
2. [ Express/Node introduction ](/en-US/docs/Learn/Server-side/Express_Nodejs/Introduction)... | |
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Mmdn_built_in_objects/Mmdn_built_in_objects_45_3.txt | Array ` ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/Array) instances returns a new
array formed by applying a given callback function to each element of the
array, and then flattening the result by one level. It is identical to a [ `
map() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map)
f... | |
Mmdn_built_in_objects/Mmdn_built_in_objects_55_1.txt | ` ](/en-US/docs/Web/JavaScript/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.defineProper... | |
Mmdn_built_in_objects/322323_14_0.txt | [ Mei ](https://forum.freecodecamp.org/u/Mei) October 16, 2019, 8:25pm 3 | |
Mmdn_built_in_objects/jsmapsasp_442_0.txt | ##### Get Certified | |
Mmdn_built_in_objects/Mmdn_built_in_objects_51_7.txt | 26. [ SyntaxError: continue must be inside loop ](/en-US/docs/Web/JavaScript/Reference/Errors/Bad_continue)
27. [ SyntaxError: for-in loop head declarations may not have initializers ](/en-US/docs/Web/JavaScript/Reference/Errors/Invalid_for-in_initializer)
28. [ SyntaxError: function statement requires a nam... | |
Mmdn_built_in_objects/4usesofjavascriptsar_166_0.txt | In this tutorial, we looked at four uses of the ` .map() ` method in
JavaScript. In combination with other methods, the functionality of ` .map() `
can be extended. For more information, see our [ How To Use Array Methods in
JavaScript: Iteration Methods
](https://www.digitalocean.com/community/tutorials/how-to-use-arr... | |
Mmdn_built_in_objects/Mmdn_built_in_objects_4_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/Mmdn_built_in_objects_29_1.txt | TML/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/Introduction_to_HTML/D... | |
Mmdn_built_in_objects/jsmapsasp_396_0.txt | ` instanceof ` Map returns true: | |
Mmdn_built_in_objects/322323_21_0.txt | [ Onosgb ](https://forum.freecodecamp.org/u/Onosgb) October 16, 2019, 9:08pm
5 | |
Mmdn_built_in_objects/Mmdn_built_in_objects_45_5.txt | in ` core-js ` ](https://github.com/zloirock/core-js#ecmascript-array)
* [ Indexed collections ](/en-US/docs/Web/JavaScript/Guide/Indexed_collections) guide
* [ ` Array ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array)
* [ ` Array.prototype.concat() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Ob... | |
Mmdn_built_in_objects/Mmdn_built_in_objects_29_10.txt | ve environment, with short lessons and interactive tests, guided by
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Mmdn_built_in_objects/jsmapsasp_391_0.txt | ## Maps are Objects | |
Mmdn_built_in_objects/Mmdn_built_in_objects_41_4.txt | github.com/zloirock/core-js#ecmascript-array)
* [ Indexed collections ](/en-US/docs/Web/JavaScript/Guide/Indexed_collections) guide
* [ ` Array ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array)
* [ ` Array.prototype.toString() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/toString)
... | |
Mmdn_built_in_objects/javascriptmapmethod_6_0.txt |  | |
Mmdn_built_in_objects/jsmapsasp_281_0.txt | ](/videos/index.php "HTML Video Tutorial") | |
Mmdn_built_in_objects/4usesofjavascriptsar_234_0.txt | ###### Company | |
Mmdn_built_in_objects/Mmdn_built_in_objects_67_2.txt | /JavaScript/Reference/Global_Objects/Array/values)
43. [ ` Array.prototype.with() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/with)
6. **Inheritance**
7. **[ ` Function ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function) **
8. Constructor
1. [ ` Function() constructor ` ](... | |
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Mmdn_built_in_objects/322323_6_0.txt | In ES6, I wrote the code as: | |
Mmdn_built_in_objects/jsmapsasp_427_0.txt | [ UPGRADE ](/plus/index.php) | |
Mmdn_built_in_objects/Mmdn_built_in_objects_8_1.txt | ance]() ` ](/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)
4. [ ` Fun... | |
Mmdn_built_in_objects/jsmapsasp_280_0.txt | Learn the basics of HTML in a fun and engaging video tutorial | |
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Mmdn_built_in_objects/322323_23_0.txt | return {
title: e.Title,
rating: e.imdbRating
}
}); | |
Mmdn_built_in_objects/Mmdn_built_in_objects_36_1.txt | ipt/Guide/Keyed_collections)
12. [ Working with objects ](/en-US/docs/Web/JavaScript/Guide/Working_with_objects)
13. [ Using classes ](/en-US/docs/Web/JavaScript/Guide/Using_classes)
14. [ Using promises ](/en-US/docs/Web/JavaScript/Guide/Using_promises)
15. [ JavaScript typed arrays ](/en-US/docs/Web/J... | |
Mmdn_built_in_objects/jsmapsasp_73_0.txt | [ Web Statistics ](/browsers/default.asp "Web Statistics") | |
Mmdn_built_in_objects/Mmdn_built_in_objects_78_4.txt | 50. [ null ](/en-US/docs/Web/JavaScript/Reference/Operators/null)
51. [ Nullish coalescing assignment (??=) ](/en-US/docs/Web/JavaScript/Reference/Operators/Nullish_coalescing_assignment)
52. [ Nullish coalescing operator (??) ](/en-US/docs/Web/JavaScript/Reference/Operators/Nullish_coalescing)
53. [ Object... | |
Mmdn_built_in_objects/jsmapsasp_353_0.txt | ## JS Graphics | |
Mmdn_built_in_objects/jsmapsasp_136_0.txt | ### HTML and CSS | |
Mmdn_built_in_objects/Mmdn_built_in_objects_60_18.txt | s/Web/API/TrustedTypePolicy)
* [ ` TrustedTypePolicyFactory ` ](/en-US/docs/Web/API/TrustedTypePolicyFactory)
### U
* [ ` UIEvent ` ](/en-US/docs/Web/API/UIEvent)
* [ ` URL ` ](/en-US/docs/Web/API/URL)
* [ ` URLPattern ` ](/en-US/docs/Web/API/URLPattern) Experimental
* [ ` URLSearchParams ` ](/en-US/docs/... | |
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Mmdn_built_in_objects/jsmapsasp_341_0.txt | ## JS HTML DOM | |
Mmdn_built_in_objects/Mmdn_built_in_objects_2_1.txt | 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/fill)
8. [ ` Array.protot... | |
Mmdn_built_in_objects/javascriptmapmethod_65_0.txt | 
[ Sahil Mahapatra ](/news/author/sahil-mahapatra/) | |
Mmdn_built_in_objects/322323_3_0.txt | [ Mei ](https://forum.freecodecamp.org/u/Mei) October 16, 2019, 5:38pm 1 | |
Mmdn_built_in_objects/jsmapsasp_259_0.txt | Test yourself with multiple choice questions | |
Mmdn_built_in_objects/Mmdn_built_in_objects_41_2.txt | Reference/Global_Objects/Array/values)
43. [ ` Array.prototype.with() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/with)
6. **Inheritance**
7. **[ ` Function ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function) **
8. Constructor
1. [ ` Function() constructor ` ](/en-US/docs/... | |
Mmdn_built_in_objects/Mmdn_built_in_objects_16_2.txt | rence/Global_Objects/Array/values)
43. [ ` Array.prototype.with() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/with)
6. **Inheritance**
7. **[ ` Function ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function) **
8. Constructor
1. [ ` Function() constructor ` ](/en-US/docs/Web/... | |
Mmdn_built_in_objects/javascriptmapmethod_63_0.txt | ADVERTISEMENT | |
Mmdn_built_in_objects/Mmdn_built_in_objects_64_4.txt | urgeon"]
// removed is [], no elements removed
### Remove 0 (zero) elements before index 2, and insert "drum" and "guitar"
js
const myFish = ["angel", "clown", "mandarin", "sturgeon"];
const removed = myFish.splice(2, 0, "drum", "guitar");
// myFish is ["angel", "clown", "drum", ... | |
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Mmdn_built_in_objects/Mmdn_built_in_objects_46_3.txt | y ` ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/Array) instances returns a new
_[ array iterator ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/Iterator) _ object that
iterates the value of each item in the array.
## Try it
## Syntax
js
values()
### Parameters
None.
### ... | |
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Mmdn_built_in_objects/4usesofjavascriptsar_124_0.txt | // create a function to use
const makeSweeter = sweetItem => sweetItem * 2; | |
Mmdn_built_in_objects/Mmdn_built_in_objects_60_6.txt | ` ](/en-US/docs/Web/API/CustomStateSet)
### D
* [ ` DataTransfer ` ](/en-US/docs/Web/API/DataTransfer)
* [ ` DataTransferItem ` ](/en-US/docs/Web/API/DataTransferItem)
* [ ` DataTransferItemList ` ](/en-US/docs/Web/API/DataTransferItemList)
* [ ` DecompressionStream ` ](/en-US/docs/Web/API/DecompressionStre... | |
Mmdn_built_in_objects/Mmdn_built_in_objects_4_3.txt | docs/Web/JavaScript/Reference/Global_Objects/Array) instances returns a new
_[ array iterator ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/Iterator) _ object that
contains the keys for each index in the array.
## Try it
## Syntax
js
keys()
### Parameters
None.
### Return value
A... | |
Mmdn_built_in_objects/4usesofjavascriptsar_239_0.txt | * [ Tutorials ](/community/tutorials)
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Mmdn_built_in_objects/jsmapsasp_101_0.txt | [ Learn MongoDB ](/mongodb/index.php "MongoDB Tutorial") [ Tutorial
](/mongodb/index.php "MongoDB Tutorial") | |
Mmdn_built_in_objects/Mmdn_built_in_objects_62_3.txt | al_Objects/Object#null-prototype_objects)
with property names given below and their values set to ` true ` .
Property attributes of ` Array.prototype[@@unscopables] `
---
Writable | no
Enumerable | no
Configurable | yes
## Description
The default ` Array ` properties that are ignored for ` with... | |
Mmdn_built_in_objects/Mmdn_built_in_objects_13_1.txt | dth ](/en-US/docs/Glossary/Bandwidth)
28. [ Base64 ](/en-US/docs/Glossary/Base64)
29. [ Baseline ](/en-US/docs/Glossary/Baseline)
30. [ Beacon ](/en-US/docs/Glossary/Beacon)
31. [ Bézier curve ](/en-US/docs/Glossary/Bezier_curve)
32. [ BiDi ](/en-US/docs/Glossary/BiDi)
33. [ BigInt ](/en-US/doc... | |
Mmdn_built_in_objects/jsmapsasp_309_0.txt | #### Code Game | |
Mmdn_built_in_objects/jsmapsasp_419_0.txt | [ Log in ](https://profile.w3schools.com/log-
in?redirect_url=https%3A%2F%2Fpathfinder.w3schools.com "Login to your
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Mmdn_built_in_objects/Mmdn_built_in_objects_70_7.txt | US/docs/Web/JavaScript/Reference/Strict_mode#no_this_substitution) , primitive
` this ` values are wrapped into objects, and ` undefined ` / ` null ` is
substituted with [ ` globalThis ` ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/globalThis) . The ` thisArg `
argument is irrelevant for any ` callbackFn ` de... | |
Mmdn_built_in_objects/javascriptmapmethod_13_0.txt | The Map method in JavaScript is a higher-order function that iterates over
each element of an array, allowing you to apply a specified function to each
element. This function is commonly referred to as a callback function. | |
Mmdn_built_in_objects/Mmdn_built_in_objects_70_14.txt | ference/Global_Objects/Array/reduce)
, and [ ` reduceRight() ` ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/Array/reduceRight) methods â
and see the next example, which uses the [ ` forEach() ` ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach) method.
### Call a function on each elemen... | |
Mmdn_built_in_objects/javascriptmapmethod_43_0.txt | #### With Map: | |
Mmdn_built_in_objects/javascriptmapmethod_45_0.txt |
Using the ` map ` method, we pass a callback function that converts each name
( ` name ` ) in the ` names ` array to uppercase using the ` toUpperCase() `
method. | |
Mmdn_built_in_objects/4usesofjavascriptsar_213_0.txt | ### Become a contributor | |
Mmdn_built_in_objects/Mmdn_built_in_objects_23_2.txt | # Parameters
` prop `
The [ ` String ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/String)
name or [ Symbol ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol)
of the property to test.
### Return value
Returns ` true ` if the object has the specified property as own property; `
false ` o... | |
Mmdn_built_in_objects/4usesofjavascriptsar_15_0.txt | Networking | |
Mmdn_built_in_objects/jsmapsasp_345_0.txt | ## JS Web APIs | |
Mmdn_built_in_objects/4usesofjavascriptsar_10_0.txt | * [ Droplets ](/products/droplets)
* [ Kubernetes ](/products/kubernetes)
* [ CPU-Optimized Droplets ](/products/droplets/cpu-optimized)
* [ Functions ](/products/functions)
* [ App Platform ](/products/app-platform)
* [ GPUs ](/products/paperspace) | |
Mmdn_built_in_objects/4usesofjavascriptsar_238_0.txt | ###### Community |
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