Render Function

Render function is a normal function which receives a createElement method as it’s first argument used to create virtual nodes. Internally Vue.js’ templates actually compile down to render functions at build time. Hence templates are just syntactic sugar of render functions.

<template>
  <div :class="{'is-rounded': isRounded}">
    <p>Welcome to Vue render functions</p>
  </div>
</template>

and the compiled down or explicit render function would appear as below,

render: function (createElement) {
  return createElement('div', {
    'class': {
      'is-rounded': this.isRounded
     }
  }, [
    createElement('p', 'Welcome to Vue render functions')
  ]);
}