how to make radio button selected by default in jquery code example

Example 1: jquery select radio

$(function() {
    var $radios = $('input:radio[name=gender]');
    if($radios.is(':checked') === false) {
        $radios.filter('[value=Male]').prop('checked', true);
    }
});

Example 2: jquery select specific radio button by value

$("input[name=mygroup][value=" + value + "]").prop('checked', true);