@specs-feup/lara/api/lara/Numbers.js

A js port of the popular framework for building source-to-source compilers

export default class Numbers {
    /**
     * @param number - A number to convert to indexes.
     * @returns An array with indexes corresponding to the active bits of the given number
     */
    static toIndexesArray(number) {
        // Convert number to binary string
        const binaryString = number.toString(2);
        const indexesArray = [];
        const numBits = binaryString.length;
        for (let i = 0; i < numBits; i++) {
            if (binaryString[i] === "0") {
                continue;
            }
            indexesArray.push(numBits - i - 1);
        }
        return indexesArray.reverse();
    }
    /**
     * Taken from here: https://stackoverflow.com/questions/3959211/fast-factorial-function-in-javascript#3959275
     */
    static factorial(num) {
        let rval = 1;
        for (let i = 2; i <= num; i++) {
            rval *= i;
        }
        return rval;
    }
    /**
     * @deprecated THIS IS NOT A MEAN!!! THIS CALCULATES AN AVERAGE!!!.
     */
    static mean(values) {
        return Numbers.average(values);
    }
    static average(values) {
        return values.reduce((acc, value) => acc + value, 0) / values.length;
    }
    /**
     * @returns Sum of the given values.
     */
    static sum(values) {
        return values.reduce((acc, value) => acc + value, 0);
    }
}
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