JSFiddle - React, Tailwind, and code Playground

by sg3s

HTML

<div>
    <div>
        <div>
            <div>
                <div>
                    <div>
                        <div>
                            <div>
                                <div>
                                    <div>
                                        <div>
                                            <div>
                                                <div>
                                                    <div>
                                                        <div>
                                                            <div>
                                                                <div>
                                                                    <div>
                                                                        <div>
                                                                            <div>
                                                                                <div>
                                                                                    <div>
                                                                                        <div>
                                                                                            <div>
                                                                                                <div>
                                                                                                    <div>
                                                                                                        <div>

CSS

div { padding: 5px; }

JavaScript

jQuery(function($) {
    $.fn.alternateNestedBgColor = function(subselect, colors) {
        // While not a great optimization, length of the colors array always stays the same
        var l = colors.length;
        
        // Itterate over all element in possible array
        // jQuery best practice to handle initializing multiple elements at once
        return this.each(function() {
            var $sub = $(this), i = 0; 
            
            // Executes code, at least once
            do {
                
                // Set bg color for current $sub element
                $sub.css('backgroundColor', colors[i++ % l]);
                // Set $sub to direct children matching given selector
                $sub = $sub.children(subselect);
                
                // Will repeat the do section when the condition returns true
            } while ($sub.length > 0);
        });
    };
    
    // target first div in the body
    // first argument = child selector
    // second argument = array list of colors
    $('body>div').alternateNestedBgColor('div', ['red', 'green', 'blue', 'purple', 'grey']);
});