feat: headers getter from table

package.json

@@ -3,6 +3,7 @@
   "version": "0.1.4",
   "description": "Dmein is a modern JavaScript Library to create objects that easily mutate data through relationships, filtering, and tranforming the shape of data.",
   "main": "index.js",
+  "type": "module",
   "directories": {
     "test": "tests"
   },

src/entities/Table.js

@@ -10,11 +10,27 @@ class Table {
       id: this.id,
       label: this.label,
       rows: this.rows,
+      headers: this.headers,
       type: this.type,
       isValid: this.isValid
     }
   }
 
+  get headers () {    
+    const rows = this.rows
+
+    if (!Array.isArray(rows) || rows.length < 1) return []
+
+    const length = rows.length
+    let lengthToSlice = 49
+    if (length < 50) lengthToSlice = length
+    const firstSliceOfRows = rows.slice(0, lengthToSlice)
+    const headersOfSplicedRows = firstSliceOfRows.map(r => Object.keys(r))
+    const flatenedHeaders = headersOfSplicedRows.flat()
+    const uniqueHeaders = Array.from(new Set(flatenedHeaders))
+    return uniqueHeaders
+  }
+
   export = () => this.rows
 
   setRows = rows => {

tests/core/NoduleTests.js

@@ -23,6 +23,7 @@ const getNodeProperties = () => {
         id: 'XYZ',
         label: 'Test Table',
         rows: [{ id: 'abc', data: 'row' }],
+        headers: [ 'id', 'data' ],
         type: 'Table',
         isValid: true
       }
@@ -79,6 +80,7 @@ const importTables = () => {
       id: 'XYZ',
       label: 'Test Table',
       rows: [{ id: 'abc', data: 'row' }],
+      headers: [ 'id', 'data' ],
       type: 'Table',
       isValid: true
     }],
@@ -134,6 +136,7 @@ const setTables = () => {
       id: 'XYZ',
       label: 'Test Table',
       rows: [{ id: 'abc', data: 'row' }],
+      headers: [ 'id', 'data' ],
       type: 'Table',
       isValid: true
     }],

tests/core/nodules/filterNoduleTests.js

@@ -419,6 +419,7 @@ const getAsTable = () => {
       { id: 'qwe', count: 4, contractor: 'AshBritt' },
       { id: 'xyz', count: 2, contractor: 'HeyDay' }
     ],
+    headers: [ 'id', 'count', 'contractor' ],
     type: 'Table',
     isValid: true
   }

tests/core/tableTests.js

@@ -17,6 +17,7 @@ const getTableProperties = () => {
       { id: '2345676', type: 'row', lat: 54, long: 31 },
       { id: '2345676', type: 'lh', lat: 31, long: -71.34 }
     ],
+    headers: [ "id", "type", "lat", "long" ],
     type: 'Table',
     isValid: true
   }
@@ -115,6 +116,7 @@ const createTableWithEverythingButRows = () => {
     id: 'abc',
     label: 'Test Label',
     rows: [],
+    headers: [],
     type: 'Table',
     isValid: true
   }
@@ -171,6 +173,7 @@ const createTableWithRowsAsNotArray = () => {
     rows: [
       { id: '2345676', type: 'lh', lat: 31, long: -71.34 }
     ],
+    headers: [ 'id', 'type', 'lat', 'long' ],
     type: 'Table',
     isValid: true
   }
@@ -205,6 +208,7 @@ const setTableRows = () => {
       { id: '2345676', type: 'row', lat: 54, long: 31 },
       { id: '2345676', type: 'lh', lat: 31, long: -71.34 }
     ],
+    headers: [ 'id', 'type', 'lat', 'long' ],
     type: 'Table',
     isValid: true
   }
@@ -221,14 +225,29 @@ const setTableRows = () => {
   }
 }
 
+const getTableHeaders = () => { 
+  const expectedOutput = ["id", "type", "lat", "long"]
+
+  try {
+    const table = new Table(input)
+    const headers = table.headers
+    if (JSON.stringify(headers) === JSON.stringify(expectedOutput)) return true
+    else return false
+  } catch (err) {
+    console.log(err)
+    return false
+  }
+}
+
 export default [
   { name: 'Entity | Get Table Properties', test: getTableProperties },
   { name: 'Entity | Get Table Rows', test: getTableRows },
-  { name: 'Entiry | Table With Invalid Props', test: createTableWithNoProps },
-  { name: 'Entiry | Table With Only Id', test: createTableWithOnlyId },
-  { name: 'Entiry | Table With Only Label', test: createTableWithOnlyLabel },
-  { name: 'Entiry | Table With Everything But Rows', test: createTableWithEverythingButRows },
-  { name: 'Entiry | Table With Invalid Rows', test: createTableWithInvalidRows },
-  { name: 'Entiry | Table With Rows as Not Array', test: createTableWithRowsAsNotArray },
-  { name: 'Entiry | Set Table Rows', test: setTableRows }
+  { name: 'Entity | Table With Invalid Props', test: createTableWithNoProps },
+  { name: 'Entity | Table With Only Id', test: createTableWithOnlyId },
+  { name: 'Entity | Table With Only Label', test: createTableWithOnlyLabel },
+  { name: 'Entity | Table With Everything But Rows', test: createTableWithEverythingButRows },
+  { name: 'Entity | Table With Invalid Rows', test: createTableWithInvalidRows },
+  { name: 'Entity | Table With Rows as Not Array', test: createTableWithRowsAsNotArray },
+  { name: 'Entity | Set Table Rows', test: setTableRows },
+  { name: 'Entity | Table Headers Getter', test: getTableHeaders }
 ]