Helpful Handlebars template helpers.

checkbox.js

// Show an HTML encoded checkbox for the result of a boolean like value.
Handlebars.registerHelper('checkbox', function (obj) {
  return new Handlebars.SafeString(obj==true ? '☑' : '☐')
})

dump.js

// Returns HTML JSON dump in a pre tag.
Handlebars.registerHelper('dump', function (obj) {
  return new Handlebars.SafeString("<pre>"+JSON.stringify(obj, true, 2)+"</pre>")
})

length.js

// Returns the length of the array, length property or the number of object keys on the object.
Handlebars.registerHelper('length', function (obj) {
    if (Array.isArray(obj)) {
        return obj.length
    } else if (obj.hasOwnProperty('length')) {
        return obj.length
    } else {
        return Object.keys(obj).length
    }
});

toHex.js

// To Hex with pad left with 0.
Handlebars.registerHelper('toHex', function (obj, zeroPadCount) {
  if (zeroPadCount===undefined) {
    zeroPadCount = 2
  }
  return parseInt(obj, 10).toString(16).toUpperCase().padStart(zeroPadCount, '0')
})