Creates jsdig based on ruby's hash#dig

.babelrc

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+{
+  "presets": [
+    [
+      "@babel/preset-env"
+    ],
+    [
+      "minify"
+    ]
+  ]
+}

.eslintrc.js

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+module.exports = {
+  env: {
+    browser: true,
+    es6: true,
+  },
+  extends: [
+    'airbnb-base',
+  ],
+  globals: {
+    Atomics: 'readonly',
+    SharedArrayBuffer: 'readonly',
+  },
+  parserOptions: {
+    ecmaVersion: 2018,
+    sourceType: 'module',
+  },
+  rules: {
+  },
+};

.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules
+jspm_packages
+
+# Optional npm cache directory
+.npm
+
+# Optional REPL history
+.node_repl_history
+
+# Editors
+.idea
+
+# Lib
+lib
+
+# npm package lock
+package-lock.json
+yarn.lock
+
+others
+.DS_Store

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2020 Christoph Drechsler <[email protected]>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# License
+
+MIT © Christoph Drechsler

package.json

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+{
+  "name": "jsdig",
+  "version": "0.0.1",
+  "description": "Based on Ruby's hash#dig",
+  "main": "./lib/index.js",
+  "scripts": {
+    "test": "mocha --require @babel/register",
+    "test:prod": "cross-env BABEL_ENV=production npm run test",
+    "build": "BABEL_ENV=production babel src --out-dir lib",
+    "prepublish": "npm run test && npm run build"
+  },
+  "files": [
+    "lib",
+    "src"
+  ],
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/devchris/jsdig.git"
+  },
+  "keywords": [
+    "javascript",
+    "ruby",
+    "dig",
+    "hash"
+  ],
+  "author": "Christoph Drechsler <[email protected]>",
+  "license": "MIT",
+  "homepage": "https://github.com/devchris/jsdig#readme",
+  "devDependencies": {
+    "@babel/cli": "^7.8.4",
+    "@babel/core": "^7.9.0",
+    "@babel/preset-env": "^7.9.5",
+    "@babel/register": "^7.9.0",
+    "babel-plugin-add-module-exports": "^1.0.0",
+    "babel-polyfill": "^6.26.0",
+    "babel-preset-env": "^1.6.1",
+    "babel-preset-minify": "^0.5.0",
+    "chai": "^4.2.0",
+    "mocha": "^7.1.1"
+  }
+}

src/index.js

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+const Dig = (obj, ...keys) => {
+  if (typeof obj !== 'object' || obj === null) return null;
+
+  let digest = obj;
+
+  for (let i = 0, len = keys.length; i < len; i++) {
+    if (typeof digest === 'undefined' || digest === null) {
+      return null;
+    }
+
+    digest = digest[keys[i]];
+  }
+
+  return digest;
+};
+
+export default Dig;

test/index.js

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+import { assert } from 'chai';
+import Dig from '../src';
+
+describe('Dig', () => {
+  it('returns null if passed in value is not an object or array', () => {
+    assert(Dig('', 'name') === null);
+  });
+
+  it('returns the wanted value from an object', () => {
+    const testObject = { name: 'Christoph', label: 'C' };
+
+    assert(Dig(testObject, 'name') === 'Christoph');
+  })
+
+  it('returns the wanted value from a nested object', () => {
+    const testObject = {
+      name: 'Christoph',
+      labels: {
+        first: {
+          value: '123'
+        }
+      }
+    };
+
+    assert(Dig(testObject, 'labels', 'first', 'value') === '123');
+  })
+
+  it('returns the wanted value from a nested object inside an array', () => {
+    const testObject = [{
+      name: 'Christoph',
+      labels: {
+        first: {
+          value: '123'
+        }
+      }
+    }];
+
+    assert(Dig(testObject, 0, 'labels', 'first', 'value') === '123');
+  })
+
+  it('returns the wanted value from a nested object inside an array of an object', () => {
+    const testObject = {
+      other: {
+        more: [{
+          name: 'Christoph',
+          labels: {
+            first: {
+              value: '123'
+            }
+          }
+        }]
+      }
+    };
+
+    assert(Dig(testObject, 'other', 'more', 0, 'labels', 'first', 'value') === '123');
+  })
+
+  it('will return null if key does not exist', () => {
+    const testObject = {
+      other: {
+        more: [{
+          name: 'Christoph',
+          labels: {
+            first: {
+              value: '123'
+            }
+          }
+        }]
+      }
+    };
+
+    assert(Dig(testObject, 'other', 'more', 0, 'wrong', 'first', 'value') === null);
+  })
+});