feat(pipe): add value-by-key pipe

libs/utils/angular/src/lib/value-by-key/value-by-key.module.ts

+import { CommonModule } from '@angular/common';
+import { NgModule } from '@angular/core';
+import { ValueByKeyPipe } from './value-by-key.pipe';
+
+@NgModule({
+  declarations: [ValueByKeyPipe],
+  imports: [CommonModule],
+  exports: [ValueByKeyPipe]
+})
+export class ValueByKeyModule {}

libs/utils/angular/src/lib/value-by-key/value-by-key.pipe.spec.ts

+import { ValueByKeyPipe } from './value-by-key.pipe';
+
+describe('ValueByKeyPipe', () => {
+  let pipe: ValueByKeyPipe;
+
+  beforeEach(() => {
+    pipe = new ValueByKeyPipe();
+  });
+
+  it('create an instance', () => {
+    expect(pipe).toBeTruthy();
+  });
+
+  it('should return a value when the key exists in the object', () => {
+    expect(pipe.transform({ a: 'test' }, 'a')).toEqual('test');
+  });
+
+  it('should return null if the key is not found in the object', () => {
+    expect(pipe.transform({ a: 'test' }, 'b')).toBeNull();
+  });
+
+  it('should return null if the object is nil', () => {
+    expect(pipe.transform(undefined, 'a')).toBeNull();
+    expect(pipe.transform(null, 'a')).toBeNull();
+  });
+
+  it('should return null if the key is nil', () => {
+    expect(pipe.transform({ a: 'test' }, undefined)).toBeNull();
+    expect(pipe.transform({ a: 'test' }, null)).toBeNull();
+  });
+});

libs/utils/angular/src/lib/value-by-key/value-by-key.pipe.ts

+import { Pipe, PipeTransform } from '@angular/core';
+import { pathOr } from 'ramda';
+
+@Pipe({
+  name: 'valueByKey'
+})
+export class ValueByKeyPipe implements PipeTransform {
+  public transform(value: object, key: string): any {
+    return pathOr(null, [key], value);
+  }
+}

libs/utils/package.json

@@ -4,7 +4,8 @@
   "peerDependencies": {
     "@angular/common": "^8.0.0",
     "@angular/core": "^8.0.0",
-    "@angular/cdk": "^8.2.3"
+    "@angular/cdk": "^8.2.3",
+    "ramda": "^0.27.0"
   },
   "private": false,
   "repository": {

package.json

@@ -61,6 +61,7 @@
     "@psu/schematics": "^1.0.4-beta.13",
     "@types/jest": "24.0.9",
     "@types/node": "~8.9.4",
+    "@types/ramda": "^0.26.43",
     "backoff-rxjs": "^6.3.3",
     "codelyzer": "~5.0.1",
     "commitizen": "^4.0.3",
@@ -78,6 +79,7 @@
     "ngx-cookie": "^4.1.2",
     "npm-link-check": "3.0.0",
     "prettier": "1.18.2",
+    "ramda": "^0.27.0",
     "short-uuid": "^3.1.1",
     "ts-jest": "24.0.0",
     "ts-mocks": "^2.6.0",

yarn.lock

@@ -1609,6 +1609,13 @@
   resolved "https://nexus.ci.psu.edu/repository/npm-all/@types/normalize-package-data/-/normalize-package-data-2.4.0.tgz#e486d0d97396d79beedd0a6e33f4534ff6b4973e"
   integrity sha512-f5j5b/Gf71L+dbqxIpQ4Z2WlmI/mPJ0fOkGGmFgtb6sAu97EPczzbS3/tJKxmcYDj55OX6ssqwDAWOHIYDRDGA==
 
+"@types/ramda@^0.26.43":
+  version "0.26.43"
+  resolved "https://nexus.ci.psu.edu/repository/npm-all/@types/ramda/-/ramda-0.26.43.tgz#62e235ea17133b8629bc891a26851cf0ea2b4204"
+  integrity sha512-VK2EaHR/fpeMNPDboGSPAmH+a6HN1pflWqRt67Jii2n8vGpYt6vxIBc1ZdoYrA/jQXRaGGpJKRiSPcHALRD3/A==
+  dependencies:
+    ts-toolbelt "^6.3.3"
+
 "@types/resolve@0.0.8":
   version "0.0.8"
   resolved "https://nexus.ci.psu.edu/repository/npm-all/@types/resolve/-/resolve-0.0.8.tgz#f26074d238e02659e323ce1a13d041eee280e194"
@@ -9384,6 +9391,11 @@ ramda@0.24.1:
   resolved "https://nexus.ci.psu.edu/repository/npm-all/ramda/-/ramda-0.24.1.tgz#c3b7755197f35b8dc3502228262c4c91ddb6b857"
   integrity sha1-w7d1UZfzW43DUCIoJixMkd22uFc=
 
+ramda@^0.27.0:
+  version "0.27.0"
+  resolved "https://nexus.ci.psu.edu/repository/npm-all/ramda/-/ramda-0.27.0.tgz#915dc29865c0800bf3f69b8fd6c279898b59de43"
+  integrity sha512-pVzZdDpWwWqEVVLshWUHjNwuVP7SfcmPraYuqocJp1yo2U1R7P+5QAfDhdItkuoGqIBnBYrtPp7rEPqDn9HlZA==
+
 randomatic@^3.0.0:
   version "3.1.1"
   resolved "https://nexus.ci.psu.edu/repository/npm-all/randomatic/-/randomatic-3.1.1.tgz#b776efc59375984e36c537b2f51a1f0aff0da1ed"
@@ -11345,6 +11357,11 @@ ts-node@~7.0.0:
     source-map-support "^0.5.6"
     yn "^2.0.0"
 
+ts-toolbelt@^6.3.3:
+  version "6.3.5"
+  resolved "https://nexus.ci.psu.edu/repository/npm-all/ts-toolbelt/-/ts-toolbelt-6.3.5.tgz#5cb4e0454ab954faa9b6e4d5bce366fdb262e364"
+  integrity sha512-Xvh/gvBBCRU1qGeholaN8kgiwBH4neyun6VIDDsJf/jNwz4PXyR8ZY/5qdpB1DuMBrWMG2oTT1oWcOzGPOnluQ==
+
 tsconfig-paths-webpack-plugin@3.2.0:
   version "3.2.0"
   resolved "https://nexus.ci.psu.edu/repository/npm-all/tsconfig-paths-webpack-plugin/-/tsconfig-paths-webpack-plugin-3.2.0.tgz#6e70bd42915ad0efb64d3385163f0c1270f3e04d"