ap-nth-term/dist/index.js

Find nth term of arithmetic progression from given array

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.findNthAP = findNthAP;
/**
 * Find nth term of arithmetic progression from given array
 * @param arr - array containing at least 2 terms of AP
 * @param n - nth term to find (1-based)
 * @returns nth term of AP
 */
function findNthAP(arr, n) {
    if (!Array.isArray(arr) || arr.length < 2) {
        throw new Error("Array must have at least two numbers of an arithmetic progression");
    }
    if (!Number.isInteger(n) || n <= 0) {
        throw new Error("n must be a positive integer");
    }
    const a = arr[0]; // first term
    const secondTerm = arr[1];
    if (a === undefined || secondTerm === undefined) {
        throw new Error("Array must have at least two defined numbers of an arithmetic progression");
    }
    const d = secondTerm - a; // common difference
    return a + (n - 1) * d;
}
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