Edit in JSFiddle

$(function () {
    $("#Btn_Each").click(function () {
        $("#msg").html("");

        $.each([1, 3, 5, 7, 9], function (idx, val) {
            $("#msg").append("idx:" + idx + ", val:" + val + "<br/>");
        });

        $.each({ id: 123, name: "xian", lang: "zh_tw" }, function (key, val) {
            $("#msg").append("key:" + key + ", value:" + val + "<br/>");
        });
    });

    $("#Btn_Grep").click(function () {
        var arr1 = [1, 2, 3, 4, 5, 6, 7, 8, 9];

        var arr2 = $.grep(arr1, function (ele, idx) {
            return ele % 2 == 0 && idx > 3;
        });

        var arr3 = $.grep(arr1, function (ele, idx) {
            return ele % 2 == 0 && idx > 3;
        }, true);

        $("#msg").html("arr1:" + arr1.join(", ") + "<br/>");
        $("#msg").append("arr2:" + arr2.join(", ") + "<br/>");
        $("#msg").append("arr3:" + arr3.join(", ") + "<br/>");
    });

    $("#Btn_Map").click(function () {
        var arr1 = [1, 2, 3, 4, 5, 6, 7, 8, 9];

        var arr2 = $.map(arr1, function (ele, idx) {
            return ele * 2;
        });

        $("#msg").html("arr1:" + arr1.join(", ") + "<br/>");
        $("#msg").append("arr2:" + arr2.join(", ") + "<br/>");
    });

    $("#Btn_Merge").click(function () {
        var arr1 = [1, 3, 5, 7, 9];
        $("#msg").html("arr1:" + arr1.join(", ") + "<br/>");

        var arr2 = [2, 4, 6, 8, 10];
        $("#msg").append("arr2:" + arr2.join(", ") + "<br/>");

        $.merge(arr1, arr2);
        $("#msg").append("arr1:" + arr1.join(", ") + "<br/>");
    });

    $("#Btn_Unique").click(function () {
        var arr1 = [1, 1, 1, 2, 2, 2, 3, 4, 5, 6, 6, 6, 7, 8, 9];
        $("#msg").html("arr1:" + arr1.join(", ") + "<br/>");

        $.unique(arr1);
        $("#msg").append("arr1:" + arr1.join(", ") + "<br/>");
    });
});

<input type="button" id="Btn_Each" value="each" />
<input type="button" id="Btn_Grep" value="grep" />
<input type="button" id="Btn_Map" value="map" />
<input type="button" id="Btn_Merge" value="merge" />
<input type="button" id="Btn_Unique" value="unique" />
<br />
<fieldset>
    <legend>output</legend>
    <div id="msg"></div>
</fieldset>