Pull data processing pipeline

pull-data-processing.js

/*
* Prototype of a data processing pipeline
* that uses strings as an example.
* the idea is to be fault tolerant by processing
* each word and so allow filtering of bad data
* instead of a batch processing approach 
* which can cause the pipeline to halt on errors
* without any good data make it through to
* completion.
*/

const capitalizeWord = word => {
   return word[0].toUpperCase() + word.slice(1);
}

const reverseWord = word => {
   return word.split('').reverse().join('');
}

const isString = (wordMaybe) => typeof wordMaybe === 'string'; 

const process = (word) => [word].map(reverseWord).map(capitalizeWord)[0];

const transform = (list) => {
   return list.reduce((acc, word) => {
      if(isString(word)) {
         acc.push(process(word))
      } else {
         console.warn(`${word} is not a string`);
      }

      return acc;
   }, []);
}

const list = ['cat', 'dog', 'mouse', '01', 23, 45]

const result = transform(list); 
console.log(result); // => 
/**
​​​23 is not a string​​​

​​​45 is not a string​​​
 
[ 'Tac', 'God', 'Esuom', '10' ] 
*/