{"id":12343,"date":"2019-07-15T15:39:38","date_gmt":"2019-07-15T20:39:38","guid":{"rendered":"http:\/\/jianmingli.com\/wp\/?p=12343"},"modified":"2019-09-04T18:20:02","modified_gmt":"2019-09-04T23:20:02","slug":"mule-4-dataweave-2-0-overview","status":"publish","type":"post","link":"https:\/\/jianmingli.com\/wp\/?p=12343","title":{"rendered":"Mule 4:Dataweave 2.0 Examples"},"content":{"rendered":"
\n

Contents<\/h2>\n
    \n\t
  1. \n\t\tOverview<\/a>\n\t<\/li>\n\t
  2. \n\t\tQuick Start<\/a>\n\t\t
      \n\t\t\t
    1. \n\t\t\t\tPrerequisites<\/a>\n\t\t\t<\/li>\n\t\t\t
    2. \n\t\t\t\tSetup a Project<\/a>\n\t\t\t<\/li>\n\t\t\t
    3. \n\t\t\t\tConcatenate String<\/a>\n\t\t\t<\/li>\n\t\t\t
    4. \n\t\t\t\t<\/a>\n\t\t\t<\/li>\n\t\t\t
    5. \n\t\t\t\tJSON to XML<\/a>\n\t\t\t<\/li>\n\t\t\t
    6. \n\t\t\t\tSupported Data Types<\/a>\n\t\t\t<\/li>\n\t\t\t
    7. \n\t\t\t\tDefine and Use Var as Input<\/a>\n\t\t\t<\/li>\n\t\t\t
    8. \n\t\t\t\tUse Function<\/a>\n\t\t\t<\/li>\n\t\t\t
    9. \n\t\t\t\tRead from an Input<\/a>\n\t\t\t<\/li>\n\t\t\t
    10. \n\t\t\t\tRead From a File<\/a>\n\t\t\t<\/li>\n\t\t\t
    11. \n\t\t\t\tmap Function<\/a>\n\t\t\t<\/li>\n\t\t\t
    12. \n\t\t\t\tpluck Function<\/a>\n\t\t\t<\/li>\n\t\t\t
    13. \n\t\t\t\tMore Complex<\/a>\n\t\t\t<\/li>\n\t\t<\/ol>\n\t
    14. \n\t\tOperators<\/a>\n\t\t
        \n\t\t\t
      1. \n\t\t\t\tRelational\/Equality Operators<\/a>\n\t\t\t<\/li>\n\t\t\t
      2. \n\t\t\t\tLogical Operators<\/a>\n\t\t\t<\/li>\n\t\t\t
      3. \n\t\t\t\tPrepend or Append Operators for Arrays<\/a>\n\t\t\t<\/li>\n\t\t<\/ol>\n\t
      4. \n\t\tFlow Controls<\/a>\n\t\t
          \n\t\t\t
        1. \n\t\t\t\tdo<\/a>\n\t\t\t<\/li>\n\t\t\t
        2. \n\t\t\t\tif\/else if\/else<\/a>\n\t\t\t<\/li>\n\t\t<\/ol>\n\t
        3. \n\t\tReferences<\/a>\n\t<\/li>\n<\/ol>\n<\/ol>\n<\/div>\n
           <\/div>\n

          Overview<\/h2><\/span>\n

          Quick Start<\/h2><\/span>\n

          Prerequisites<\/h3><\/span>\n

          * Studio 7<\/p>\n

          Setup a Project<\/h3><\/span>\n

          * File > New > Mule Project
          \n– Project Name: testscript
          \n* Drag Transform Message to canvas<\/p>\n

          Concatenate String<\/h3><\/span>\n

          <\/h3><\/span>\n

          * Script<\/p>\n

          %dw 2.0\noutput application\/json\n---\n{\n\tmyString: (\"hello\" ++ \" world\")\n}\n<\/pre>\n
          * Output<\/p>\n
          {\n  \"myString\": \"hello world\"\n}\n<\/pre>\n
          JSON to XML<\/h3><\/span>\n
          * Script<\/p>\n
          %dw 2.0\noutput application\/xml\n---\n{\n\t\"myString\": (\"hello\" ++ \" world\")\n}\n<\/pre>\n
          * Output<\/p>\n
          \nhello world<\/mystring>\n<\/pre>\n
          Supported Data Types<\/h3><\/span>\n
          * Script<\/p>\n
          %dw 2.0\noutput application\/json\n---\n{\n  \/*\n   * A multi-line\n   * comment here.\n   *\/\n  myString: \"hello world\",\n  myNumber: 123,\n  myFloatingPointNumber: 123.456,\n  myVeryBigNumber: 12341234134123412341234123,\n  myDate: |2018-12-07|,\n  myTime: |11:55:56|,\n  myDateTime: |2018-10-01T23:57:59-03:00|,\n  myBoolean: true,\n  myArray: [ 1, 2, 3, 5, 8],\n  myMixedArray: [ 1, 2, \"blah\", { hello: \"there\" } ],\n  myObjectKeyValuePair: { innerKey: \"innerValue\" },\n  myObjectWithConditionalField: { a : { b : 1, ( c : 2 ) if true, (d : 4) if false } },\n  myNull: null,\n  myBinary: \"abcd1234123\" as Binary\n  \/\/A one-line comment here.\n}\n<\/pre>\n
          * Output<\/p>\n
          {\n  \"myString\": \"hello world\",\n  \"myNumber\": 123,\n  \"myFloatingPointNumber\": 123.456,\n  \"myVeryBigNumber\": 12341234134123412341234123,\n  \"myDate\": \"2018-12-07\",\n  \"myTime\": \"11:55:56\",\n  \"myDateTime\": \"2018-10-01T23:57:59-03:00\",\n  \"myBoolean\": true,\n  \"myArray\": [\n    1,\n    2,\n    3,\n    5,\n    8\n  ],\n  \"myMixedArray\": [\n    1,\n    2,\n    \"blah\",\n    {\n      \"hello\": \"there\"\n    }\n  ],\n  \"myObjectKeyValuePair\": {\n    \"innerKey\": \"innerValue\"\n  },\n  \"myObjectWithConditionalField\": {\n    \"a\": {\n      \"b\": 1,\n      \"c\": 2\n    }\n  },\n  \"myNull\": null,\n  \"myBinary\": \"abcd1234123\"\n}\n<\/pre>\n
          Define and Use Var as Input<\/h3><\/span>\n
          * Script<\/p>\n
          %dw 2.0\nvar myjson = {\"hello\": \"world\"}\noutput application\/json\n---\nmyjson\n<\/pre>\n
          * Output<\/p>\n
          {\n  \"hello\": \"world\"\n}\n<\/pre>\n
          Use Function<\/h3><\/span>\n
          * Script<\/p>\n
          %dw 2.0\nvar myjson = {\n\t\"a\": avg([1,1000]),\n\t\"b\": avg([1,2,3])\n}\noutput application\/json\n---\nmyjson\n<\/pre>\n
          * Output<\/p>\n
          {\n  \"a\": 500.5,\n  \"b\": 2.0\n}\n<\/pre>\n
          Read from an Input<\/h3><\/span>\n
          * Script<\/p>\n
          %dw 2.0\nvar myRead = read(\"Read<\/color><\/car>\", \"application\/xml\")\noutput application\/json\n---\n{\n\tmySelection: myRead.car\n}\n<\/pre>\n
          * Output<\/p>\n
          {\n  \"mySelection\": {\n    \"color\": \"Read\"\n  }\n}\n<\/pre>\n
          Read From a File<\/h3><\/span>\n
          * Script<\/p>\n
          %dw 2.0\noutput application\/json\n---\nreadUrl(\"classpath:\/\/myJason.json\", \"application\/json\")\n<\/pre>\n
          * Output<\/p>\n
          {\n  \"hello\": \"world\"\n}\n<\/pre>\n
          map Function<\/h3><\/span>\n
          * Script<\/p>\n
          %dw 2.0\noutput application\/json\n---\n{\n\t( \/\/Need this to evaluate\n\t\t[\"a\",\"b\",\"c\"] map ((value, index) -> {\n\t\t\t(index): value\n\t\t})\n\t)\n}\n<\/pre>\n
          * Output<\/p>\n
          {\n  \"0\": \"a\",\n  \"1\": \"b\",\n  \"2\": \"c\"\n}\n<\/pre>\n
          pluck Function<\/h3><\/span>\n
          * Script<\/p>\n
          %dw 2.0\noutput application\/json\n---\n{\n  \"0\": \"a\",\n  \"1\": \"b\",\n  \"2\": \"c\"\n} pluck ((value) -> value)\n<\/pre>\n
          * Output<\/p>\n
          [\n  \"a\",\n  \"b\",\n  \"c\"\n]\n<\/pre>\n
          More Complex<\/h3><\/span>\n
          * Script<\/p>\n
          %dw 2.0\nvar myVar = [\n  { bookId: 101,\n    title: \"world history\",\n    price: \"19.99\"\n  },\n  {\n    bookId: 202,\n    title: 'the great outdoors',\n    price: \"15.99\"\n  }\n]\nvar myVar2 = [\n  {\n    bookId: 101,\n    author: \"john doe\"\n  },\n  {\n    bookId: 202,\n    author: \"jane doe\"\n  }\n]\noutput application\/json\n---\nmyVar map (item, index) -> using (id = item.bookId) {\n\t\"id\" : id,\n\t\"topic\" : item.title,\n\t\"cost\" : item.price as Number,\n\t(myVar2 filter ($.*bookId contains id) map (item) -> {\n\t\tauthor : item.author\n\t})\n}\n<\/pre>\n
          * Output<\/p>\n
          [\n  {\n    \"id\": 101,\n    \"topic\": \"world history\",\n    \"cost\": 19.99,\n    \"author\": \"john doe\"\n  },\n  {\n    \"id\": 202,\n    \"topic\": \"the great outdoors\",\n    \"cost\": 15.99,\n    \"author\": \"jane doe\"\n  }\n]\n<\/pre>\n
          Operators<\/h2><\/span>\n
          Relational\/Equality Operators<\/h3><\/span>\n
          ==\n~=\n<\n>\n<=\n>=\n<\/pre>\n
          Logical Operators<\/h3><\/span>\n
          not # (not true or true) is same as (not(true or true)) which evaluates to false\n!   # (!true or true) is same as (false or true) which evaluates to true\nand\nor\n<\/pre>\n
          Prepend or Append Operators for Arrays<\/h3><\/span>\n
          >> # Prpends to left side of array so 1 >> [2] results in [1,2]\n<< # Appends to right side of array so 2 << [1] results in [1,2]\n+  # [1] + 2 results in [1,2]. Array is always on the left-hand side of the operator\n<\/pre>\n
          Flow Controls<\/h2><\/span>\n
          do<\/h3><\/span>\n
          * Creates a scope<\/p>\n
          %dw 2.0\noutput application\/json\nfun myfun() = do {\n\tvar msg = \"Hello World!\"\n\t---\n\tmsg\n}\nfun sayhi(s: String) = do {\n\tvar msg = \"Hello \" ++ s ++ \"!\"\n\t---\n\tmsg\n}\n---\n{\n\tresult: myfun(),\n\tresult: sayhi(\"Jimmy\")\n}\n<\/pre>\n
          * Output<\/p>\n
          {\n  \"result\": \"Hello World!\",\n  \"result\": \"Hello Jimmy!\"\n}<\/pre>\n
          if\/else if\/else<\/h3><\/span>\n
          %dw 2.0\noutput application\/json\n---\nif (true)\n\t{ result: \"passed\"}\nelse\n\t{ result: \"failed\"}\n<\/pre>\n
          * Output<\/p>\n
          {\n  \"result\": \"passed\"\n}\n<\/pre>\n
          References<\/h2><\/span>\n
          * Introduction to Mule 4: DataWeave 2.0<\/a>
          \n*           DataWeave Quickstart<\/a>
          \n*           DataWeave Language<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
          Overview Quick Start Prerequisites * Studio 7 Setup a Project * File > New > Mule Project – Project Name: testscript * Drag Transform Message to canvas Concatenate String * Script %dw 2.0 output application\/json — { myString: (“hello” ++ … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[819],"tags":[816,815],"class_list":["post-12343","post","type-post","status-publish","format-standard","hentry","category-mule4","tag-dataweave2","tag-mule4"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p8cRUO-3d5","_links":{"self":[{"href":"https:\/\/jianmingli.com\/wp\/index.php?rest_route=\/wp\/v2\/posts\/12343","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jianmingli.com\/wp\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jianmingli.com\/wp\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jianmingli.com\/wp\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/jianmingli.com\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=12343"}],"version-history":[{"count":4,"href":"https:\/\/jianmingli.com\/wp\/index.php?rest_route=\/wp\/v2\/posts\/12343\/revisions"}],"predecessor-version":[{"id":12359,"href":"https:\/\/jianmingli.com\/wp\/index.php?rest_route=\/wp\/v2\/posts\/12343\/revisions\/12359"}],"wp:attachment":[{"href":"https:\/\/jianmingli.com\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=12343"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jianmingli.com\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=12343"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jianmingli.com\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=12343"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}