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ts-enum-util

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ts-enum-util - npm Package Compare versions

Comparing version 0.2.2 to 1.0.0

38

dist/commonjs/index.js

@@ -33,2 +33,5 @@ "use strict";

* Used for reverse key lookups.
* NOTE: Performance tests show that using a Map (even if it's a slow polyfill) is faster than building a lookup
* string key for values and using a plain Object:
* {@link https://jsperf.com/polyfill-map-vs-es6-map-vs-object-with-string-key}
*/

@@ -41,2 +44,4 @@ this.keysByValueMap = new Map();

this.valuesList = new Array(length);
// According to multiple tests found on jsperf.com, a plain for loop is faster than using
// Array.prototype.forEach
for (var index = 0; index < length; ++index) {

@@ -193,2 +198,4 @@ var key = this.keysList[index];

var length = this.length;
// According to multiple tests found on jsperf.com, a plain for loop is faster than using
// Array.prototype.forEach
for (var index = 0; index < length; ++index) {

@@ -213,2 +220,3 @@ var entry = this[index];

var result = new Array(length);
// According to multiple tests found on jsperf.com, a plain for loop is faster than using Array.prototype.map
for (var index = 0; index < length; ++index) {

@@ -248,2 +256,3 @@ var entry = this[index];

var result = new Array(length);
// According to multiple tests found on jsperf.com, a plain for loop is faster than using Array.prototype.map
for (var index = 0; index < length; ++index) {

@@ -348,3 +357,11 @@ var entry = this[index];

EnumWrapper.prototype.getKeyOrThrow = function (value) {
return this.keysByValueMap.get(this.asValueOrThrow(value));
// NOTE: Intentionally not using isValue() or asValueOrThrow() to avoid making two key lookups into the map
// for successful lookups.
var result = (value != null) ? this.keysByValueMap.get(value) : undefined;
if (result != null) {
return result;
}
else {
throw new Error("Unexpected value: " + value + ". Expected one of: " + this.getValues());
}
};

@@ -362,4 +379,6 @@ /**

EnumWrapper.prototype.getKeyOrDefault = function (value, defaultKey) {
if (this.isValue(value)) {
return this.keysByValueMap.get(value);
// NOTE: Intentionally not using isValue() to avoid making two key lookups into the map for successful lookups.
var result = (value != null) ? this.keysByValueMap.get(value) : undefined;
if (result != null) {
return result;
}

@@ -378,2 +397,5 @@ else {

EnumWrapper.prototype.getValueOrThrow = function (key) {
// NOTE: The key MUST be separately validated before looking up the entry in enumObj to avoid false positive
// lookups for keys that match properties on Object.prototype, or keys that match the index keys of
// reverse lookups on numeric enums.
return this.enumObj[this.asKeyOrThrow(key)];

@@ -390,2 +412,5 @@ };

EnumWrapper.prototype.getValueOrDefault = function (key, defaultValue) {
// NOTE: The key MUST be separately validated before looking up the entry in enumObj to avoid false positive
// lookups for keys that match properties on Object.prototype, or keys that match the index keys of
// reverse lookups on numeric enums.
if (this.isKey(key)) {

@@ -402,3 +427,8 @@ // type cast required to work around TypeScript bug:

* Map of enum object -> EnumWrapper instance.
* Used as a cache for {@link EnumWrapper.getCachedInstance}.
* Used as a cache for {@link EnumWrapper.getCachedInstance} (and {@link $enum}).
* NOTE: Performance tests show that object key lookups into a Map (even if it's a slow polyfill) are plenty fast
* for this use case of a relatively small number of items in the map, assuming you don't do something stupid
* like lookup a cached instance within a tight loop. It's also an order of magnitude faster than building
* a unique string key for each object and using a fast native Map with the generated string key:
* {@link https://jsperf.com/map-with-object-keys}
*/

@@ -405,0 +435,0 @@ EnumWrapper.instancesCache = new Map();

38

dist/es/index.js

@@ -31,2 +31,5 @@ /**

* Used for reverse key lookups.
* NOTE: Performance tests show that using a Map (even if it's a slow polyfill) is faster than building a lookup
* string key for values and using a plain Object:
* {@link https://jsperf.com/polyfill-map-vs-es6-map-vs-object-with-string-key}
*/

@@ -39,2 +42,4 @@ this.keysByValueMap = new Map();

this.valuesList = new Array(length);
// According to multiple tests found on jsperf.com, a plain for loop is faster than using
// Array.prototype.forEach
for (var index = 0; index < length; ++index) {

@@ -191,2 +196,4 @@ var key = this.keysList[index];

var length = this.length;
// According to multiple tests found on jsperf.com, a plain for loop is faster than using
// Array.prototype.forEach
for (var index = 0; index < length; ++index) {

@@ -211,2 +218,3 @@ var entry = this[index];

var result = new Array(length);
// According to multiple tests found on jsperf.com, a plain for loop is faster than using Array.prototype.map
for (var index = 0; index < length; ++index) {

@@ -246,2 +254,3 @@ var entry = this[index];

var result = new Array(length);
// According to multiple tests found on jsperf.com, a plain for loop is faster than using Array.prototype.map
for (var index = 0; index < length; ++index) {

@@ -346,3 +355,11 @@ var entry = this[index];

EnumWrapper.prototype.getKeyOrThrow = function (value) {
return this.keysByValueMap.get(this.asValueOrThrow(value));
// NOTE: Intentionally not using isValue() or asValueOrThrow() to avoid making two key lookups into the map
// for successful lookups.
var result = (value != null) ? this.keysByValueMap.get(value) : undefined;
if (result != null) {
return result;
}
else {
throw new Error("Unexpected value: " + value + ". Expected one of: " + this.getValues());
}
};

@@ -360,4 +377,6 @@ /**

EnumWrapper.prototype.getKeyOrDefault = function (value, defaultKey) {
if (this.isValue(value)) {
return this.keysByValueMap.get(value);
// NOTE: Intentionally not using isValue() to avoid making two key lookups into the map for successful lookups.
var result = (value != null) ? this.keysByValueMap.get(value) : undefined;
if (result != null) {
return result;
}

@@ -376,2 +395,5 @@ else {

EnumWrapper.prototype.getValueOrThrow = function (key) {
// NOTE: The key MUST be separately validated before looking up the entry in enumObj to avoid false positive
// lookups for keys that match properties on Object.prototype, or keys that match the index keys of
// reverse lookups on numeric enums.
return this.enumObj[this.asKeyOrThrow(key)];

@@ -388,2 +410,5 @@ };

EnumWrapper.prototype.getValueOrDefault = function (key, defaultValue) {
// NOTE: The key MUST be separately validated before looking up the entry in enumObj to avoid false positive
// lookups for keys that match properties on Object.prototype, or keys that match the index keys of
// reverse lookups on numeric enums.
if (this.isKey(key)) {

@@ -400,3 +425,8 @@ // type cast required to work around TypeScript bug:

* Map of enum object -> EnumWrapper instance.
* Used as a cache for {@link EnumWrapper.getCachedInstance}.
* Used as a cache for {@link EnumWrapper.getCachedInstance} (and {@link $enum}).
* NOTE: Performance tests show that object key lookups into a Map (even if it's a slow polyfill) are plenty fast
* for this use case of a relatively small number of items in the map, assuming you don't do something stupid
* like lookup a cached instance within a tight loop. It's also an order of magnitude faster than building
* a unique string key for each object and using a fast native Map with the generated string key:
* {@link https://jsperf.com/map-with-object-keys}
*/

@@ -403,0 +433,0 @@ EnumWrapper.instancesCache = new Map();

10

dist/types/index.d.ts

@@ -28,3 +28,8 @@ /**

* Map of enum object -> EnumWrapper instance.
* Used as a cache for {@link EnumWrapper.getCachedInstance}.
* Used as a cache for {@link EnumWrapper.getCachedInstance} (and {@link $enum}).
* NOTE: Performance tests show that object key lookups into a Map (even if it's a slow polyfill) are plenty fast
* for this use case of a relatively small number of items in the map, assuming you don't do something stupid
* like lookup a cached instance within a tight loop. It's also an order of magnitude faster than building
* a unique string key for each object and using a fast native Map with the generated string key:
* {@link https://jsperf.com/map-with-object-keys}
*/

@@ -43,2 +48,5 @@ private static readonly instancesCache;

* Used for reverse key lookups.
* NOTE: Performance tests show that using a Map (even if it's a slow polyfill) is faster than building a lookup
* string key for values and using a plain Object:
* {@link https://jsperf.com/polyfill-map-vs-es6-map-vs-object-with-string-key}
*/

@@ -45,0 +53,0 @@ private readonly keysByValueMap;

2

package.json
{
"name": "ts-enum-util",
"version": "0.2.2",
"version": "1.0.0",
"description": "TypeScript Enum Utilities",

@@ -5,0 +5,0 @@ "repository": {

2

README.md

@@ -166,4 +166,2 @@ [![npm version](https://img.shields.io/npm/v/ts-enum-util.svg)](https://www.npmjs.com/package/ts-enum-util)

### Lookup value by key
See also:
- [Wrapped enums are Map-Like](#wrapped-enums-are-map-like)
```ts

@@ -170,0 +168,0 @@ // type: RGB

39

src/index.ts

@@ -31,3 +31,8 @@ /**

* Map of enum object -> EnumWrapper instance.
* Used as a cache for {@link EnumWrapper.getCachedInstance}.
* Used as a cache for {@link EnumWrapper.getCachedInstance} (and {@link $enum}).
* NOTE: Performance tests show that object key lookups into a Map (even if it's a slow polyfill) are plenty fast
* for this use case of a relatively small number of items in the map, assuming you don't do something stupid
* like lookup a cached instance within a tight loop. It's also an order of magnitude faster than building
* a unique string key for each object and using a fast native Map with the generated string key:
* {@link https://jsperf.com/map-with-object-keys}
*/

@@ -49,2 +54,5 @@ private static readonly instancesCache = new Map<object, EnumWrapper>();

* Used for reverse key lookups.
* NOTE: Performance tests show that using a Map (even if it's a slow polyfill) is faster than building a lookup
* string key for values and using a plain Object:
* {@link https://jsperf.com/polyfill-map-vs-es6-map-vs-object-with-string-key}
*/

@@ -215,2 +223,4 @@ private readonly keysByValueMap = new Map<V, keyof T>();

// According to multiple tests found on jsperf.com, a plain for loop is faster than using
// Array.prototype.forEach
for (let index = 0; index < length; ++index) {

@@ -349,2 +359,4 @@ const key = this.keysList[index];

// According to multiple tests found on jsperf.com, a plain for loop is faster than using
// Array.prototype.forEach
for (let index = 0; index < length; ++index) {

@@ -371,2 +383,3 @@ const entry = this[index];

// According to multiple tests found on jsperf.com, a plain for loop is faster than using Array.prototype.map
for (let index = 0; index < length; ++index) {

@@ -411,2 +424,3 @@ const entry = this[index];

// According to multiple tests found on jsperf.com, a plain for loop is faster than using Array.prototype.map
for (let index = 0; index < length; ++index) {

@@ -587,3 +601,11 @@ const entry = this[index];

public getKeyOrThrow(value: V | null | undefined): keyof T {
return this.keysByValueMap.get(this.asValueOrThrow(value));
// NOTE: Intentionally not using isValue() or asValueOrThrow() to avoid making two key lookups into the map
// for successful lookups.
const result = (value != null) ? this.keysByValueMap.get(value) : undefined;
if (result != null) {
return result;
} else {
throw new Error(`Unexpected value: ${value}. Expected one of: ${this.getValues()}`);
}
}

@@ -646,4 +668,7 @@

public getKeyOrDefault(value: V | null | undefined, defaultKey?: keyof T | string): string | undefined {
if (this.isValue(value)) {
return this.keysByValueMap.get(value);
// NOTE: Intentionally not using isValue() to avoid making two key lookups into the map for successful lookups.
const result = (value != null) ? this.keysByValueMap.get(value) : undefined;
if (result != null) {
return result;
} else {

@@ -662,2 +687,5 @@ return defaultKey;

public getValueOrThrow(key: string | null | undefined): T[keyof T] {
// NOTE: The key MUST be separately validated before looking up the entry in enumObj to avoid false positive
// lookups for keys that match properties on Object.prototype, or keys that match the index keys of
// reverse lookups on numeric enums.
return this.enumObj[this.asKeyOrThrow(key)];

@@ -711,2 +739,5 @@ }

public getValueOrDefault(key: string | null | undefined, defaultValue?: T[keyof T] | V): V | undefined {
// NOTE: The key MUST be separately validated before looking up the entry in enumObj to avoid false positive
// lookups for keys that match properties on Object.prototype, or keys that match the index keys of
// reverse lookups on numeric enums.
if (this.isKey(key)) {

@@ -713,0 +744,0 @@ // type cast required to work around TypeScript bug:

dist/commonjs/index.js.map

Sorry, the diff of this file is not supported yet

dist/es/index.js.map

Sorry, the diff of this file is not supported yet

LICENSE

Sorry, the diff of this file is not supported yet

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