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@stdlib/utils-async-map-values

0.2.2

Map values from one object to a new object having the same keys.

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2.0.2

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1.0.3

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@stdlib/utils-async-map-keys

Map keys from one object to a new object having the same values.

0.2.2

Apache-2.0

JavaScript

77.80 kB

4,507 4.2

Installations

npm install @stdlib/utils-async-map-keys

Developer Guide

BETA

Typescript

Yes

Module System

CommonJS

Min. Node Version

>=0.10.0

Node Version

16.20.2

NPM Version

8.19.4 Score

68.6

Supply Chain

83.7

Quality

82.3

Maintenance

100

Vulnerability

87.6

License

Pull Requests

Open

0

Total

0

Closed

0

Issues

Open

0

Total

0

Closed

0

Releases

Unable to fetch releases

Contributors

Unable to fetch Contributors

View All 11 Contributors

Languages

JavaScript

JavaScript (100%)

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Developer

stdlib-js

Download Statistics

Total Downloads

4,507

Last Day

Last Week

Last Month

Last Year

826

GitHub Statistics

Apache-2.0 License

2 Stars

67 Commits

3 Watchers

5 Branches

11 Contributors

Updated on Dec 01, 2024

Sponsor this package

https://opencollective.com/stdlib

Maintainers

Package Meta Information

Latest Version

0.2.2

Package Id

@stdlib/utils-async-map-keys@0.2.2

Unpacked Size

77.80 kB

Size

15.80 kB

File Count

NPM Version

8.19.4

Node Version

16.20.2

Published on

Jul 28, 2024

Total Downloads

Cumulative downloads

Total Downloads

4,507

Last Day

-50%

Compared to previous day

Last Week

8.3%

Compared to previous week

Last Month

6.5%

Compared to previous month

Last Year

-38.1%

826

Compared to previous year

Daily Downloads

Weekly Downloads

Monthly Downloads

Yearly Downloads

Dependencies

@stdlib/assert-has-own-property @stdlib/assert-is-boolean @stdlib/assert-is-function @stdlib/assert-is-plain-object @stdlib/assert-is-positive-integer @stdlib/constants-float64-pinf @stdlib/string-format @stdlib/utils-define-nonenumerable-read-only-property @stdlib/utils-keys debug @stdlib/error-tools-fmtprodmsg

About stdlib...

We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.

The library is fully decomposable, being architected in such a way that you can swap out and mix and match APIs and functionality to cater to your exact preferences and use cases.

When you use stdlib, you can be absolutely certain that you are using the most thorough, rigorous, well-written, studied, documented, tested, measured, and high-quality code out there.

To join us in bringing numerical computing to the web, get started by checking us out on GitHub, and please consider financially supporting stdlib. We greatly appreciate your continued support!

mapKeysAsync

Map keys from one object to a new object having the same values.

Installation

1npm install @stdlib/utils-async-map-keys

Usage

1var mapKeysAsync = require( '@stdlib/utils-async-map-keys' );

mapKeysAsync( obj, [options,] transform, done )

Map keys from one object to a new object having the same values.

1function transform( key, next ) {
2    setTimeout( onTimeout, 0 );
3    function onTimeout() {
4        next( null, key+':beep' );
5    }
6}
7
8function done( error, out ) {
9    if ( error ) {
10        throw error;
11    }
12    console.log( out );
13    // => { 'a:beep': 1, 'b:beep': 2 }
14}
15
16var obj = {
17    'a': 1,
18    'b': 2
19};
20
21mapKeysAsync( obj, transform, done );

The next callback accepts two arguments: error and key. The second argument to the next callback is the transformed property name. If a transform function calls the next callback with a truthy error argument, the function stops processing any additional own properties and calls the done callback for error processing.

1function transform( key, value, next ) {
2    setTimeout( onTimeout, value );
3    function onTimeout() {
4        if ( value === 1 ) {
5            return next( new Error( 'boop' ) );
6        }
7        next( null, key+':beep' );
8    }
9}
10
11function done( error ) {
12    if ( error ) {
13        console.error( error.message );
14        // => 'boop'
15    }
16}
17
18var obj = {
19    'a': 1,
20    'b': 2
21};
22
23mapKeysAsync( obj, transform, done );

The function accepts the following options:

limit: the maximum number of pending invocations at any one time. Default: infinity.
series: boolean indicating whether to sequentially invoke the transform function for each own property. If true, the function sets options.limit=1. Default: false.
thisArg: the execution context for fcn.

By default, all properties are processed concurrently, which means that the function does not guarantee completion order. To process each property sequentially, set the series option to true.

1function transform( key, value, next ) {
2    setTimeout( onTimeout, value );
3    function onTimeout() {
4        next( null, key+':beep' );
5    }
6}
7
8function done( error, out ) {
9    if ( error ) {
10        throw error;
11    }
12    console.log( out );
13    // => { 'a:beep': 1, 'b:beep': 2 }
14}
15
16var obj = {
17    'a': 1,
18    'b': 2
19};
20
21var opts = {
22    'series': true
23};
24
25mapKeysAsync( obj, opts, transform, done );

To limit the maximum number of pending function invocations, set the limit option.

1function transform( key, value, next ) {
2    setTimeout( onTimeout, value );
3    function onTimeout() {
4        next( null, key+':beep' );
5    }
6}
7
8function done( error, out ) {
9    if ( error ) {
10        throw error;
11    }
12    console.log( out );
13    // => { 'a:beep': 1, 'b:beep': 2, 'c:beep': 3 }
14}
15
16var obj = {
17    'a': 1,
18    'b': 2,
19    'c': 3
20};
21
22var opts = {
23    'limit': 2
24};
25
26mapKeysAsync( obj, opts, transform, done );

To set the execution context of the transform function, set the thisArg option.

1function transform( key, value, next ) {
2    this.count += 1;
3    setTimeout( onTimeout, value );
4    function onTimeout() {
5        next( null, key+':beep' );
6    }
7}
8
9var obj = {
10    'a': 1,
11    'b': 2,
12    'c': 3
13};
14
15var context = {
16    'count': 0
17};
18
19var opts = {
20    'thisArg': context
21};
22
23mapKeysAsync( obj, opts, transform, done );
24
25function done( error, out ) {
26    if ( error ) {
27        throw error;
28    }
29    console.log( out );
30    // => { 'a:beep': 1, 'b:beep': 2, 'c:beep': 3 }
31
32    console.log( context.count );
33    // => 3
34}

When invoked, the transform function is provided a maximum of four arguments:

key: object key.
value: object value corresponding to key.
obj: source object.
next: a callback which should be called once the transform function has finished processing a property.

The actual number of provided arguments depends on function length. If the transform function accepts two arguments, the transform function is provided key and next. If the transform function accepts three arguments, the transform function is provided key, value, and next. For every other transform function signature, the transform function is provided all four arguments.

1function transform( key, value, obj, next ) {
2    console.log( 'obj: %s. %s: %d', JSON.stringify( obj ), key, value );
3    setTimeout( onTimeout, value );
4    function onTimeout() {
5        next( null, key+':'+value );
6    }
7}
8
9function done( error, out ) {
10    if ( error ) {
11        throw error;
12    }
13    console.log( out );
14}
15
16var obj = {
17    'a': 1,
18    'b': 2
19};
20
21mapKeysAsync( obj, transform, done );
22/* => e.g.,
23    obj: {"a": 1, "b": 2}. a: 1
24    obj: {"a": 1, "b": 2}. b: 2
25    { 'a:1': 1, 'b:2': 2 }
26*/

mapKeysAsync.factory( [options,] transform )

Returns a function which invokes a transform function once for each own property.

1function transform( key, value, next ) {
2    setTimeout( onTimeout, value );
3    function onTimeout() {
4        next( null, key+':beep' );
5    }
6}
7
8function done( error, out ) {
9    if ( error ) {
10        throw error;
11    }
12    console.log( out );
13}
14
15var f = mapKeysAsync.factory( transform );
16
17var obj1 = {
18    'a': 1,
19    'b': 2
20};
21
22f( obj1, done );
23// => { 'a:beep': 1, 'b:beep': 2 }
24
25var obj2 = {
26    'c': 3,
27    'd': 4
28};
29
30f( obj2, done );
31// => { 'c:beep': 3, 'd:beep': 4 }

The function accepts the same options as mapKeysAsync().

Notes

If a provided function calls the next callback with a truthy error argument, the function suspends execution and immediately calls the done callback for subsequent error handling.
If provided an empty object, the function calls the done callback with an empty object.
Key iteration order is not guaranteed, as object key enumeration is not specified according to the ECMAScript specification. In practice, however, most engines use insertion order to sort an object's keys, thus allowing for iteration order.
Key insertion order is not guaranteed.
The value returned by a transform function should be a value which can be serialized as an object key.
The function only maps own properties. Hence, the function does not map inherited properties.
The function shallow copies key values.
Neither mapKeysAsync nor the function returned by the factory method guarantee asynchronous execution. To guarantee asynchrony, wrap the done callback in a function which either executes at the end of the current stack (e.g., nextTick) or during a subsequent turn of the event loop (e.g., setImmediate, setTimeout).

Examples

1var resolve = require( 'path' ).resolve;
2var readFile = require( '@stdlib/fs-read-file' );
3var mapKeysAsync = require( '@stdlib/utils-async-map-keys' );
4
5var files = {
6    'file1': resolve( __dirname, 'package.json' ),
7    'file2': resolve( __dirname, 'README.md' )
8};
9
10function read( key, value, next ) {
11    var opts = {
12        'encoding': 'utf8'
13    };
14    readFile( value, opts, onFile );
15
16    function onFile( error ) {
17        if ( error ) {
18            return next( error, key+':unreadable' );
19        }
20        next( null, key+':readable' );
21    }
22}
23
24function done( error, out ) {
25    if ( error ) {
26        throw error;
27    }
28    console.log( out );
29}
30
31mapKeysAsync( files, read, done );

Notice

This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.

Community

License

See LICENSE.

Copyright

No vulnerabilities found.

10

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10

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10

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9

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3

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Info: 33 out of 33 GitHub-owned GitHubAction dependencies pinned
Info: 19 out of 24 third-party GitHubAction dependencies pinned
Info: 0 out of 32 npmCommand dependencies pinned

0

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0

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Score

4.2

/10

Last Scanned on 2025-02-10

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Other packages similar to @stdlib/utils-async-map-keys

@stdlib/utils-async-map-keys

Installations

Developer Guide

Yes

CommonJS

>=0.10.0

16.20.2

8.19.4

Score

Pull Requests

0

0

0

Issues

0

0

0

Releases

Unable to fetch releases

Contributors

Unable to fetch Contributors

Languages

Developer

Download Statistics

GitHub Statistics

Sponsor this package

Maintainers

Package Meta Information

Total Downloads

4,507

Daily Downloads

Weekly Downloads

Monthly Downloads

Yearly Downloads

Dependencies

mapKeysAsync

Installation

Usage

mapKeysAsync( obj, [options,] transform, done )

mapKeysAsync.factory( [options,] transform )

Notes

Examples

See Also

Notice

Community

License

Copyright

10

10

10

10

9

3

0

0

0

0

0

0

0

4.2

/10