utility-function-extractor/packages/webpage-legacy/lib/utils.js

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import crypto from "crypto";
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export const hashString = (string) =>
crypto.createHash("md5").update(string).digest("hex");
const id = (x) => x;
export const transformSliderValueToActualValue = id;
export const transformSliderValueToPracticalValue = id;
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export const _transformSliderValueToActualValue = (value) => 10 ** value; //>= 2 ? Math.round(10 ** value) : Math.round(10 * 10 ** value) / 10
export const toLocale = (x) => Number(x).toLocaleString();
export const truncateValueForDisplay = (value) => {
if (value > 10) {
return Number(Math.round(value).toPrecision(2));
} else if (value > 1) {
return Math.round(value * 10) / 10;
} else if (value <= 1) {
return value;
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}
};
export const _transformSliderValueToPracticalValue = (value) =>
truncateValueForDisplay(transformSliderValueToActualValue(value));
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export function sleep(ms) {
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return new Promise((resolve) => setTimeout(resolve, ms));
}
export function numToAlphabeticalString(num) {
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// https://stackoverflow.com/questions/45787459/convert-number-to-alphabet-string-javascript/45787487
num = num + 1;
var s = "",
t;
while (num > 0) {
t = (num - 1) % 26;
s = String.fromCharCode(65 + t) + s;
num = ((num - t) / 26) | 0;
}
return `#${s}` || undefined;
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}
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let topOutAt100AndValidate = (x) => {
// return 10;
if (x == x) {
return x > 99 ? 99 : x < 0 ? 2 : x;
} else {
return 10;
}
};
export function formatLargeOrSmall(num) {
let result;
if (num >= 1) {
result = toLocale(truncateValueForDisplay(num));
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} else if (num > 0) {
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let candidateNumSignificantDigits =
-Math.floor(Math.log(num) / Math.log(10)) + 1;
let numSignificantDigits = topOutAt100AndValidate(
candidateNumSignificantDigits
);
result = num.toFixed(numSignificantDigits);
} else if (-1 < num) {
let candidateNumSignificantDigits =
-Math.floor(Math.log(Math.abs(num)) / Math.log(10)) + 1;
let numSignificantDigits = topOutAt100AndValidate(
candidateNumSignificantDigits
);
result = num.toFixed(numSignificantDigits);
} else if (num <= -1) {
result = "-" + toLocale(truncateValueForDisplay(-num));
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} else {
result = toLocale(num); //return "~0"
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}
console.log(`${num} -> ${result}`);
return result;
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}
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const firstFewMaxMergeSortSequence = [
0, 0, 1, 3, 5, 8, 11, 14, 17, 21, 25, 29, 33, 37, 41, 45, 49, 54, 59, 64, 69,
74, 79, 84, 89, 94, 99, 104, 109, 114, 119, 124, 129, 135, 141, 147, 153, 159,
165, 171, 177, 183, 189, 195, 201, 207, 213, 219, 225, 231, 237, 243, 249,
255, 261, 267, 273, 279, 285,
];
export function maxMergeSortSteps(n) {
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if (n < firstFewMaxMergeSortSequence.length) {
return firstFewMaxMergeSortSequence[n];
} else {
return (
maxMergeSortSteps(Math.floor(n / 2)) +
maxMergeSortSteps(Math.ceil(n / 2)) +
n -
1
);
}
}
export function expectedNumMergeSortSteps(n) {
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// https://cs.stackexchange.com/questions/82862/expected-number-of-comparisons-in-a-merge-step
// n-2 for each step, so (n-2) + (n-2)/2 + (n-2)/4 + ...
// ~ 2*(n-2) -1 = 2*n - 3
if (n == 0) {
return 0;
} else if (n == 1) {
return 0;
} else if (n == 2) {
return 1;
} else if (n == 3) {
return 2;
} else {
return (
Math.ceil(n ** 2 / (n + 2)) + expectedNumMergeSortSteps(Math.ceil(n / 2))
);
}
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}
const sum = (arr) => arr.reduce((a, b) => a + b, 0);
export const avg = (arr) => sum(arr) / arr.length;
export const geomMean = (arr) => {
let n = arr.length;
let logavg = sum(arr.map((x) => Math.log(x))); // works for low numbers much better
let result = Math.exp(logavg / n);
return result;
};
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export const hackyGeomMean = (arr) => {
let nonPositiveNumbers = arr.filter((x) => x <= 0);
if (nonPositiveNumbers.length == 0) {
return geomMean(arr);
} else {
return avg(arr);
}
};
export function conservativeNumMergeSortSteps(n) {
return Math.ceil((expectedNumMergeSortSteps(n) + maxMergeSortSteps(n)) / 2);
}
// export const geomMean = (arr) => arr.reduce((a, b) => a * b, 1); // ^ (1 / arr.length); // didn't work so well for low numbers.
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export const increasingList = (n) => Array.from(Array(n).keys());
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function getStdev(arr) {
if (Array.isArray(arr) && arr.length > 0) {
const n = arr.length;
const mean = arr.reduce((a, b) => a + b) / n;
return Math.sqrt(
arr.map((x) => Math.pow(x - mean, 2)).reduce((a, b) => a + b) / n
);
} else {
return 0;
}
}
export const getCoefficientOfVariation = (arr) => {
let nonPositiveNumbers = arr.filter((x) => x <= 0);
if (nonPositiveNumbers.length == 0) {
let gm = geomMean(arr);
let stdev = getStdev(arr);
return stdev / gm;
} else {
return getStdev(arr) / avg(arr);
}
};