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index-async.js
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index-async.js
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'use strict';
const Promise = require('bluebird');
class NPS {
// Public Methods
constructor(inputScores){
return new Promise((resolve, reject) => {
data = {
"detractors": null,
"passives": null,
"promoters": null,
"detractorsPercentage": null,
"passivesPercentage": null,
"promotersPercentage": null,
"summary": null,
"score": "loading"
};
validateInputScores(inputScores, function(){
calculatePercentages(inputScores);
resolve(data);
}, function(error){
reject(error);
});
});
}
}
// Private Properties
var data = {
"detractors": null,
"passives": null,
"promoters": null,
"detractorsPercentage": null,
"passivesPercentage": null,
"promotersPercentage": null,
"summary": null,
"score": "loading"
};
// Private Methods
// Cycle Through All Input Scores
function validateInputScores(inputScores, callback, error){
var lengthTotal = inputScores.length;
inputScores.forEach(function(score, index){
validateInputScore(score, function(eMessage){
return error(eMessage);
});
if((parseInt(index + 1)) == lengthTotal){
return callback();
}
});
}
// Calculate Percentages of Each
function calculatePercentages(inputScores){
var lengthTotal = inputScores.length;
data.detractorsPercentage = data.detractors/lengthTotal;
data.passivesPercentage = data.passives/lengthTotal;
data.promotersPercentage = data.promoters/lengthTotal;
calculateNPS();
}
// Calculate the Conformed NPS
function calculateNPS(){
var rawNPS = data.promotersPercentage - data.detractorsPercentage;
data.score = Math.round(rawNPS * 100);
determineSummary(data.score);
}
// Determine Summary
function determineSummary(score){
if(score === -100){
data.summary = "broken";
} if(score >= -99 && score <= -1){
data.summary = "bad";
} if(score === 0){
data.summary = "neutral";
} if(score >= 1 && score <= 50){
data.summary = "good";
} if(score >= 51 && score <= 70){
data.summary = "excellent";
} if(score >= 71 && score <= 99){
data.summary = "world class";
} if(score === 100){
data.summary = "perfect";
}
}
// Validate Input NPS
function validateInputScore(inputScore, error){
if(typeof(inputScore) != "number"){
//throw "Score must be a number";
return error("Score must be a number");
} if(inputScore < 0 || inputScore > 10){
//throw "Score is out of NPS range";
return error("Score is out of NPS range");
} else{
classifyInputScore(inputScore);
}
}
// Classify Input NPS
function classifyInputScore(inputScore){
if(inputScore <= 6){
data.detractors += 1;
return "detractor";
} if(inputScore == 7 || inputScore == 8){
data.passives += 1;
return "passive";
} if(inputScore >= 9){
data.promoters += 1;
return "promoter";
}
}
module.exports = NPS;