pmkroeker

use std::convert::TryInto;
use chrono::prelude::*; // 0.4.11

pub struct Mondays {}

impl Mondays {
    pub fn count(birth: chrono::NaiveDate, curr_date: chrono::NaiveDate) -> i64 {
        // start work at age 22
        let start_work = birth + chrono::Duration::days(22 * 365);
        // retire at age 78

pmkroeker

// https://dev.to/thepracticaldev/daily-challenge-29-xs-and-os-12mj

pub fn xo (value: &str) -> bool {
    let value = value.to_lowercase();
    let count_x = value.matches("x").count();
    let count_o = value.matches("o").count();
    count_x == count_o
}

#[cfg(test)]

pmkroeker

pub fn ccbreaker (value: &str) -> String {
    value.chars()
        .into_iter()
        .map(|c| if c.is_uppercase() { format!(" {}", c.to_lowercase()) } else { c.to_string() })
        .collect::<String>()
}

#[cfg(test)]
mod tests {
    use super::*;

pmkroeker

// Convert number to hex string.
pub fn to_hex (value: i32) -> String {
    let value = if value > 255 { 255 } else if value < 0 { 0 } else { value };
    format!("{:02X}", value)
}

// Join all hex strings together from rgb input.
pub fn rgb (r: i32, g: i32, b: i32) -> String {
    format!("{}{}{}", to_hex(r), to_hex(g), to_hex(b))
}

pmkroeker

//Original least squares found here: http://bl.ocks.org/easadler/edae96ae440aa0361a4d#leastsquares.js
//from Adam Sadler!!
//r squared calculation was added by me.

function LeastSquares(values_x, values_y) {
    var sum_x = 0;
    var sum_y = 0;
    var sum_xy = 0;
    var sum_xx = 0;
    var count = 0;