Reading-Notes

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Read: 01 - Node Ecosystem, TDD, CI/CD

Array Methods

Array.map

The array.map() method creates a new array by calling on a function element at each index of a starting array. The new array is the same length as the starting one.

Array.reduce

The array.reduce() method takes in an array and produces a single value based on a callback function.

Code snippet of superagent

normal Promise .then() syntax

 request
   .post('/api/pet')
   .send({ name: 'Manny', species: 'cat' })
   .set('X-API-Key', 'foobar')
   .set('Accept', 'application/json')
   .then(res => {
      alert('yay got ' + JSON.stringify(res.body));
   });

 request
   .get('/search')
   .then(res => {
      // res.body, res.headers, res.status
   })
   .catch(err => {
      // err.message, err.response
   });

Code provided by visionmedia

with async / await syntax

 request
  .post(my api call)
  .send(params) // an object of parameters that is to be sent to api 
  .end((err, res) => {
  if(!err) {
     let impVariable = res.resImpVariable;
  } else {
    console.log('error present');
   }
  });

Code provided by stackoverflow

Promises

A promise an object in code that is a representation of data that is currently not available but will be.

Are all callback functions considered to be Asynchronous? Why or Why Not?

Callback functions can asyncronus if used in asynchronous code.

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