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CSV Manipulation in Terminal

Problem

A 9 million row csv file should be split and combined with required data

Head

head -n 1116604 file.csv > file1.csv This will take the first n amount of rows and output to a new file

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Result

const result = [
  { contactId: 1217, emailId: 509379 },
  { contactId: 7170, emailId: 509380 },
  { contactId: 1217, emailId: 509381 },
  { contactId: 1217, emailId: 509382 }
]

Desired Result

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Resolving Node Module Errors

This addresses a number of errors.
Ex:

• Error: Node Sass does not yet support your current environment: OS X 64-bit with Unsupported runtime (72)

---

Redo Node Packages

1. Check that you are in the proper directory (/frontend/ or /main/
2. Delete package-lock.json in the correct directory
3. Recursively remove all from /node_modules/ (with sudo)

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Optional Chaining Operator == Null Propagation Operator

Currently in Stage 2 Used to check if a value in an object is undefined or null

?.

---

const firstName = person.profile.name.firstName

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try {
  yield put({
    type: 'SET_BUILDING_DOWNLOAD',
    loading: true,
    complete: false,
    loadOption: 'buildingOwnersLoading',
    completeOption: 'buildingOwnersComplete',
  });
 

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case types.RENAME_SOCIAL_SUCCESS:
  return {
    ...state,
    social: state.social.map(item => {
      if (item.socialId === action.socialId) {
        //item.name = action.name
        return {
          ...item,
 name: action.name

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case types.RENAME_SOCIAL_SUCCESS:
  return {
    ...state,
    social: state.social.map(item => {if(item.socialId === action.socialId)item.name = action.name})
  };

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const objarray = [
  {a: 1, b: 2, c:3},
  {a: 2, b: 3, c:4},
  {a: 3, b: 4, c:69},
]

objarray.filter(item => !Object.values(item).includes(69))

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Console Options

Console	What it do
.log
.trace
.time .timeEnd
.memory
.profile .profileEnd
.count

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Imported from redux-saga/effects

effect	example	what it do
put		send data to redux store
call		sends the AJAX api request
all		runs multiple effects in parallel, kind of like Promise.all
select
takeEvery
takeLatest	yield takeLatest("API_CALL_REQUEST", workerSaga)	Listens for action type and then executes workerSaga