Javascript Utility Functions

util.js

// Youtube tutorial here: https://youtu.be/LDgPTw6tePk

// These functions are designed to be exported, but you could create a class instead. See tutorial video. 

// #1 proper case
export const properCase = (string) => {
    return `${string[0].toUpperCase()}${string.slice(1).toLowerCase()}`;
};


// #2 console log
export const log = (content) => {
    console.log(content);
}

// #3 query selector with optional scope 
export const select = (selector, scope) => {
    return (scope || document).querySelector(selector);
}

// #4 addEventListener wrapper 
export const listen = (target, event, callback, capture = false) => {
    target.addEventListener(event, callback, !!capture);
}

// #5 sanitize input / escape characters
export const sanitizeInput = (inputValue) => {
    const div = document.createElement('div');
    div.textContent = inputValue;
    return div.innerHTML;
}

// #6 create an element with an optional CSS class
export const createElement = (tag, className) => {
    const el = document.createElement(tag);
    if (className) el.classList.add(className);
    return el;
}

// #7 delete all contents
export const deleteChildElements = (parentElement) => {
    let child = parentElement.lastElementChild;
    while (child) {
        parentElement.removeChild(child);
        child = parentElement.lastElementChild;
    }
}

// #8 add class with optional query scope
export const addClass = (selector, className, scope) => {
    (scope || document).querySelector(selector).classList.add(className);
}

// #9 check for iOS
export const isIOS = () => {
    return (
        (/iPad|iPhone|iPod/.test(navigator.platform) ||
            (navigator.platform === "MacIntel" && navigator.maxTouchPoints > 1)) && !window.MSStream //MSStream is to avoid IE11
    );
}

// #10 get parameters by name from url
export const getParameterValue = (paramName, url) => {
    if (!url) url = window.location.href;
    const regex = new RegExp(`[?&]${paramName}(=([^&#]*))`);
    const results = regex.exec(url);
    if (!results) return null;
    if (!results[2]) return "";
    return decodeURIComponent(results[2].replace(/\+/g, " "));
}