chalu

// Leetcode Question
// https://leetcode.com/problems/remove-duplicates-from-sorted-array-ii/?envType=study-plan-v2&envId=top-interview-150

/**
 * @param {number[]} nums
 * @return {number}
 */
var removeDuplicates = function(nums) {
    //  ASC   [1, 1, 1, 1, 1, 2, 2, 3, 4, 4, 5] 
    //  index  0  1  2  3  4  5  6  7  8  9  10

chalu

Create a function (e.g nFib) that takes a single integer parameter, n, and returns a list of the first n elements of the Fibonacci sequence.

Example in Javascript:

const nFib = (n) => {
  // TODDO solution begins here
  
  return [];
};

chalu

-- Given the data at https://gist.github.com/chalu/da81ea79bc95292e5c892621b002fe8f
-- how would you calculate the average age of the seniors.
-- I use the following ChatGPT prompt to get the formula for calculating their average age
-- "Given some age ranges like 45 - 54 and the number of people in each age range, how would you calculate the average age across all the age ranges"

-- I then wrote the below SQL

WITH age_range AS (
  -- count seniors within each age range
  SELECT SUM(

chalu

chalu

'use strict';
const fs = require('file-system');
const minimatch = require('minimatch');
const path = require('path');

const DEFAULT_CONFIG = {
    'staticPath': [ 'static' ],
    'watcherGlob': null
};

chalu

/* The API 
================== */
const noop = () => { };

// abstract matcher
const match = (field = '', delegate = noop) => {
  return (data = []) => {
    return data.filter(entry => delegate(entry[field]));
  }

chalu

const getElligibleCustomers = chain(
  customerAgeIsOrAbove(18),
  isCustomerForMoreThan3Years,
  totalItemsBoughtIsOver(50),
  shippingAddressIsWithin(['Abuja', 'Lagos', 'Ibadan'])
);

const determineDiscountSale = chain(
  getElligibleCustomers,
  discountOrdersAt('15%'),

chalu

const chain = (...fns) => {
  return (data) => {
    return fns.reduce((computed, fn) => {
      return fn(computed);
    }, data);
  };
};

// use as 
// chain(steps)(initialData)

chalu

const is = (target) => (value) => value === target;
const isOver = (target) => (value) => value > target;
const isUnder = (target) => (value) => value < target;
const isOrOver = (target) => (value) => value >= target;
const isOrUnder = (target) => (value) => value <= target;
const isMultipleOf = (target) => (value) => value % target === 0;

// thus, easy to make isEven, isOdd, isPrime, isEnabled, isConnected, isStared
// isFavorite, is404, isImageResponse e.t.c

chalu

const match = (field, delegate) => {
  return (data = []) => {
    return data.filter(entry => delegate(entry[field]));
  }
};