Includes to Handlebars | Array method

index.js

{
  includes: function (array, ...args) {
    const argumentsLength = args.length - 1;
    const options = args[argumentsLength];

    for (let i = 0; i < argumentsLength; i += 1) {
      const item = args[i];

      if (array.includes(item) === false) {
        return options.inverse(this);
      }
    }

    return options.fn(this);
  },
}

Usage.md

Includes

{{#includes myArray 'apple'}}
  There is an apple!
{{/includes}}

Several includes

{{#includes myArray 'apple' 'orange'}}
  There is an apple and an orange!
{{/includes}}