Vue js default prop

props: {
  name: {
    type: String,
    default: 'John Doe'
  }
}

Vue prop string or number

    props: {
        users_count: {
            type: [Number, String],
            required: true
        }
    },

Vuejs set default value for prop

  props: {
    title: String,
    default: function () {
      return "John Doe";
    },
  },

Vue passing props

<!-- Dynamically assign the value of a variable -->
<blog-post v-bind:title="post.title"></blog-post>

<!-- Dynamically assign the value of a complex expression -->
<blog-post
  v-bind:title="post.title + ' by ' + post.author.name"
></blog-post>

Source: vuejs.org

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