select 2 selected value code example

Example 1: select2 clear options

Remove the selected options : 
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$('#mySelect2').val(null).trigger('change');

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Completly remove the select2 initialization :
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$('#payment_method').html('').select2({data: [{id: '', text: ''}]});

Example 2: get value select 2

//get selected value
$('#mySelect2').find(':selected').val();

Example 3: select2 dropdown with option to add new item

$('#select2')
    .select2()
    .on('select2:open', () => {
        $(".select2-results:not(:has(a))").append('<a href="#" style="padding: 6px;height: 20px;display: inline-table;">Create new item</a>');
})

Example 4: html select multiple selected values

var values = $('#select-meal-type').val();

Example 5: select2 multiple selected values

in_array($value, $array)

Example 6: select 2 select a value

SELECT2 V4 :
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For select2 v4 you can append directly an option/s as follow:

<select id="myMultipleSelect2" multiple="" name="myMultipleSelect2[]">
    <option value="TheID" selected="selected">The text</option>                                                                   
</select>

Or with JQuery:
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var $newOption = $("<option selected='selected'></option>").val("TheID")
					.text("The text")
 
$("#myMultipleSelect2").append($newOption).trigger('change');

other example :
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$("#myMultipleSelect2").val(5).trigger('change');