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data.js
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data.js
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const clone = require("clone");
const array2d = require("array2d");
function getDataWithoutHeaderRow(data) {
return data.slice(1);
}
function getUniqueCategoriesCount(data) {
return getUniqueCategoriesObject(data).categories.length;
}
function getUniqueCategoriesObject(data, customCategoriesOrder) {
let hasNullValues = false;
const values = data
.map((row) => {
return row[1];
})
.filter((value) => {
if (value !== null && value !== "") {
return true;
}
hasNullValues = true;
return false;
});
let sortedValues = getSortedValues(values);
// If the user has set a custom order, sort the categories accordingly
if (customCategoriesOrder) {
sortedValues.sort(
function(a, b) {
return customCategoriesOrder.map(c => c.category).indexOf(a) -
customCategoriesOrder.map(c => c.category).indexOf(b);
});
}
return { hasNullValues, categories: [...new Set(sortedValues)] };
}
function getSortedValues(values) {
// Create a counter object on array
let counter = values.reduce((counter, key) => {
counter[key] = 1 + counter[key] || 1;
return counter;
}, {});
// Sort counter by values
let sortedCounter = Object.entries(counter).sort((a, b) => b[1] - a[1]);
return sortedCounter.map((x) => x[0]);
}
function getCustomBucketBorders(customBuckets) {
const customBorderStrings = customBuckets.split(",");
return customBorderStrings.map((borderValue) => {
return parseFloat(borderValue.trim());
});
}
function getRoundedValue(value, maxDigitsAfterComma) {
let roundingFactor = 100; // default: round to two digits after comma
// if data contains more precise float numbers we extend each value to max number of digits after comma
if (maxDigitsAfterComma !== undefined && maxDigitsAfterComma > 2) {
roundingFactor = Math.pow(10, maxDigitsAfterComma);
}
return Math.round(value * roundingFactor) / roundingFactor;
}
function getMedian(values) {
let middleIndex = Math.floor(values.length / 2);
let sortedNumbers = [...values].sort((a, b) => a - b);
if (values.length % 2 !== 0) {
return sortedNumbers[middleIndex];
}
return (sortedNumbers[middleIndex - 1] + sortedNumbers[middleIndex]) / 2;
}
function getRoundedMedian(values, maxDigitsAfterComma) {
const medianValue = getMedian(values);
return getRoundedValue(medianValue, maxDigitsAfterComma);
}
function getAverage(values) {
return values.reduce((a, b) => a + b, 0) / values.length;
}
function getRoundedAverage(values, maxDigitsAfterComma) {
const averageValue = getAverage(values);
return getRoundedValue(averageValue, maxDigitsAfterComma);
}
function getMetaData(values, numberValues, maxDigitsAfterComma) {
return {
hasNullValues: values.find((value) => value === null) !== undefined,
hasZeroValues: numberValues.find((value) => value === 0) !== undefined,
maxValue: Math.max(...numberValues),
minValue: Math.min(...numberValues),
averageValue: getRoundedAverage(numberValues, maxDigitsAfterComma),
medianValue: getRoundedMedian(numberValues, maxDigitsAfterComma),
};
}
function getNumericalValues(data) {
return data.map((row) => {
if (!row[1]) row[1] = null;
if (row[1] !== null) {
if (row[1].match(/^[+-]?\d+(\.\d+)?$/) === null) {
throw new Error("value is not a valid floating point number");
}
return parseFloat(row[1]);
}
return row[1];
});
}
function getNonNullNumericalValues(values) {
return values.filter((value) => value !== null);
}
function getNumberBuckets(numericalOptions) {
try {
if (numericalOptions.bucketType !== "custom") {
return numericalOptions.numberBuckets;
} else {
const bucketBorderValues = getCustomBucketBorders(
numericalOptions.customBuckets
);
return bucketBorderValues.length - 1; // min value is part of border values and has to be excluded here
}
} catch {
return 0;
}
}
function getDigitsAfterComma(value) {
try {
if (value !== undefined && value !== null) {
const valueParts = value.toString().split(".");
if (valueParts.length > 1) {
return valueParts[1].length;
}
}
return 0;
} catch (e) {
return 0; // if something goes wrong we just return 0 digits after comma
}
}
function getMaxDigitsAfterCommaInData(data) {
let maxDigitsAfterComma = 0;
data.forEach((row) => {
const digitsAfterComma = getDigitsAfterComma(row[1]);
maxDigitsAfterComma = Math.max(maxDigitsAfterComma, digitsAfterComma);
});
return maxDigitsAfterComma;
}
function getFlatData(data) {
const dataOnly = array2d.crop(
clone(data),
0,
1,
array2d.width(data) - 1,
array2d.height(data) - 1
);
const flatData = array2d.flatten(dataOnly);
return flatData;
}
function getMaxValue(data) {
const flatData = getFlatData(data).filter((value) => {
return value !== null && value !== undefined;
});
return flatData.reduce((a, b) => {
return Math.max(a, b);
});
}
function getMinValue(data) {
const flatData = getFlatData(data).filter((value) => {
return value !== null && value !== undefined;
});
return flatData.reduce((a, b) => {
return Math.min(a, b);
});
}
function getSubtitleSuffix(divisor, subtitle) {
let divisorString = "";
switch (divisor) {
case Math.pow(10, 9):
divisorString = "Milliarden";
break;
case Math.pow(10, 6):
divisorString = "Millionen";
break;
case Math.pow(10, 3):
divisorString = "Tausend";
break;
default:
divisorString = "";
break;
}
if (subtitle && subtitle !== "") {
return `(in ${divisorString})`;
}
return `in ${divisorString}`;
}
function getDivisorForMinMax(minValue, maxValue) {
let divisor = 1;
if (maxValue >= Math.pow(10, 9) && minValue >= Math.pow(10, 8)) {
divisor = Math.pow(10, 9);
} else if (maxValue >= Math.pow(10, 6) && minValue >= Math.pow(10, 5)) {
divisor = Math.pow(10, 6);
} else if (maxValue >= Math.pow(10, 4) && minValue >= Math.pow(10, 3)) {
divisor = Math.pow(10, 3);
}
return divisor;
}
function getDivisor(data) {
try {
const minValue = getMinValue(data);
const maxValue = getMaxValue(data);
return getDivisorForMinMax(Math.abs(minValue), maxValue);
} catch (err) {
// if something goes wrong, the divisor is just 1
return 1;
}
}
function getDividedData(data, divisor) {
return data.map((row) => {
if (row[1] !== null && row[1] !== undefined) {
row[1] = parseFloat(row[1] / divisor).toFixed(1);
}
return row;
});
}
module.exports = {
getDataWithoutHeaderRow,
getUniqueCategoriesObject,
getUniqueCategoriesCount,
getCustomBucketBorders,
getNumericalValues,
getNonNullNumericalValues,
getMetaData,
getNumberBuckets,
getMaxDigitsAfterCommaInData,
getDivisor,
getSubtitleSuffix,
getDividedData,
};