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HTML

CSS

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

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+ add another resource

JavaScript

Babel includes JSX processing.

Add External Scripts/Pens

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+ add another resource

Packages

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Code Indentation

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HTML

              
                <div id="center">
  <span>🥦 1 min + </span><input class="input" type="hidden" value="1">
  <span>🥬 2 mins + </span><input class="input" type="hidden" value="2">
  <span>🥑 3 mins + </span><input class="input" type="hidden" value="3">
  <!-- add as many input as you want... -->
  <span>🥗 = </span><span id="result"><span>
</div>
              
            
!

CSS

              
                /* preview only without prefixing stuff*/
html,
body {
  height: 100%;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
}

              
            
!

JS

              
                // 🥦 when the DOM has loaded
document.addEventListener("DOMContentLoaded", () => {
  "use strict";
  // set globals
  const inputs = document.getElementsByClassName("input"),
    result = document.getElementById("result");
  let value,
    values = [],
    sum;

  // 🥬 for each input of the array
  Array.from(inputs).forEach((input) => {
    // get value of each input by explicit coercion
    value = Number(input.value);
    //inject each value into empty "values" array
    values.push(value);
  });
  
  // make sure array doesn't contain empty values
  values = values.flat();

  // 🥑 run a reduce function on the array
  sum = values.reduce((a, b) => {
    // return the sum of the accumulator (a) + its current value (b)
    return a + b;
  }, 0); // default accumulator's value starts with 0

  // 🥗 inject result into the DOM
  // error handling + plural management using ternary operator
  result.textContent = `${sum != undefined ? sum : "undefined"} minute${sum > 1 ? "s" : ""}`;
}); // end DOM loaded

// go get a 🍦
              
            
!
999px

Console