1.8.6 Maintenance Release

• Fix bug in date/time picture string. Width formatting is not respected without a separator (issue #546)
• Fix error when converting empty array to an object (issue #547)
• Fix Buffer deprecation warning (PR #560)

1.8.5 Maintenance Release

• Fix regression with singleton sequence of array type (issue #462)
• Correctly handle empty array input to group expression (issue #527)
• Fix bug with outer array when evaluating wildcard (issue #495)

1.8.4 Maintenance Release

• Fix bug in $eval when second arg is an empty array (issue #463)
• Fix bug in toMillis() parsing timezones (issue #477)

1.8.3 Maintenance Release

• Remove incomplete polyfill for Array.from() (issue #432)
• Fix $not to return empty sequence for missing inputs (issue #433)
• Fix RangeError (stack overflow) when querying very large objects (issue #434)

1.8.2 Maintenance Release

• Fix bug with regex usage in partially applied functions (issue #427)
• Fix regression when the $string() function is applied to a top-level array (PR #429)

1.8.1 Maintenance Release

• Fix bug in timezone handling for ISO week date formats (issue #403)

1.8.0 Milestone Release

• New syntax (% parent operator) to select the parent of the current context value (issue #299)
• New function $type to return the data type of the argument (issue #208)
• Added versioning to the documentation site (issue #385)
• Fixed bugs #382, #387, #396, #399

1.7.0 Milestone Release

• New syntax (@ operator) to support cross-referencing and complex data joins (issue #333)
• New syntax (# operator) to get current context position in sequence (issue #187)
• Equality operators (=, !=) now perform deep object/array comparison
• New functions
• $error - Explicitly throw an error with message (issue #167)
• $assert - Throw error (with message) if assertion evaluates to false (issue #369)
• $single - Returns the single value in an array (issue #348)
• $encodeUrl, $encodeUrlComponent, $decodeUrl, $decodeUrlComponent - URL/URI helper functions (issue #103)
• $distinct - Returns array with duplicate values removed
• Enhanced functions
• $reduce - Now works with a 4-argument function parameter (issue #102)
• $number - Can now cast numeric strings with leading zeros (issue #368)
• $string - Now has optional second argument to "prettify" objects (issue #334)
• Minimum node.js runtime v8 (dropped support for v6). Added support for Node 12.
• Fixed bugs #316, #332, #349

1.6.5 Maintenance Release

• Fix concurrency bug in chain operator (issue #335)
• Fix flattening login in map operator (issue #314)
• Fix message inserts for errors thrown in function bodies (issue #297)
• Limit array size allocatable by range operator to ten million entries (issue #240)

1.6.4 Maintenance Release

• Fix performance regression (PR #292)
• Fix bug in $each function (PR #293)

1.6.3 Maintenance Release

• Fix es5 build and polyfills to enable test suite to (mostly) run in Nashorn (PR #288)
• Extra polyfill required for running jsonata-es5.js in IE 11 (PR #289)

1.6.2 Maintenance Release

• Fix insertion of regenerator runtime at top of ES5 file (PR #284)

1.6.1 Milestone Release (v1.6.0 was not published)

• New date/time formatting and parsing capability (issue #166)
• Support for comments in expressions (issue #75)
• Higher-order extension functions (issue #259)
• Allow Boolean to be cast to a number (issue #257)
• New functions
• $eval - parse/evaluate the contexts of a JSON/JSONata string (issue #134)
• $formatInteger - format an integer to a string using picture string definition
• $parseInteger - parse an integer from a string using picture string definition
• Non-functional enhancements:
• Split codebase into multiple files; fixed multiple issues with ES5 generated library
• Multiple conformance tests in a single file
• Documentation moved to main jsonata repo; generated using docusaurus.io
• Minimum node.js runtime v6 (dropped support for v4)
• Numerous bug fixes (#236, #179, #261, #236, #245, #246, #233, #250, #247, #242, #249)

1.5.4 Maintenance Release

• Fully test and fix bugs in async mode (PR #219)
• Publish Typescript definition file (issue #182)
• Numeric precision should be 15 decimal digits, not 13 (issue 194)
• Defining functions for use with $match etc. (issue #213)
• Fix regression in $substring for negative start position & length (issue #204)
• Fix for 'sort' syntax error (issue #210)
• Various code optimizations (issues #184, #205, #164)
• Add support for node 10.x (PR #228)

1.5.3 Maintenance Release

• $formatNumber should use zero-digit character for padding (issue #161)
• Handle undefined inputs in $formatNumber (issue #165)
• Handle surrogate pairs as single char in string functions (issue #156)
• Throw error if multiple group-by expressions evaluate to same key (issue #163)

1.5.2 Maintenance Release

• Enforce consistent syntax error when attempting to use unquoted numeric property names (issue #147)
• Invalid token on LHS of binding operator is now a syntax error rather than dynamic (runtime) error (issue #148)
• Fix corruption of predicated function calls within lambda functions (PR 149)

1.5.1 Maintenance Release

• Update $toMillis() to allow more complete range of ISO 8601 compatible dates (issue #140)
• Fix $append() so that it doesn't mutate the first argument (issue #139)

1.5.0 Milestone Release

• Restructured the entire test suite to be implementation language agnostic (PR #122)
• Provide es5 as main entry point, es6 as module entry point (PR #106)
• Added Typescript definitions to package (PR #114)
• Changes to how 'singleton sequences' are handled (issue #93)
• Unary negation of undefined (no match) should return undefined (issue #99)

1.4.1 Maintenance Release

• Object transformation syntax should work with arrays of objects as well as objects (issue #94)

1.4.0 Milestone Release

• New object transformation syntax ~> |...|...| (issue #70)
• New functions
• $formatNumber - formats a decimal number to a string using a picture specification defined in XPath F&O spec (issue #54)
• $formatBase - converts a number to a string in a specified radix
• $pad - pads a string to a minimum width with leading or trailing padding characters
• $toMillis - converts an ISO 8601 formatted date/time string to number of milliseconds since the epoch (issue #55)
• $fromMillis - converts the number of milliseconds since the epoch to an ISO 8601 formatted date/time string (issue #55)
• $clone - returns a deep copy of an object - used internally by the object transform syntax; overridable by custom implementation (issue #70)

1.3.3 Maintenance Release

• $lookup() function throws an error when the property has a null value (issue #85)

1.3.2 Maintenance Release

• Support extension functions that mix sync/async behaviours (issue #77)

1.3.1 Maintenance Release

• Fix S0202 error insert to report token value, not token type (PR #74)
• Remove use of array iterators because they were failing to transpile to ES5 correctly (issue #78)

1.3.0 Milestone Release

• Property names containing reserved tokens can now be quoted using backticks (`). The current quoting mechanism using single or double quotes is deprecated and will probably be removed in a future major (e.g. v2.0.0) release.
• The parser can be invoked in a robust mode whereby errors will be indicated by an error token in the parse tree rather than throwing an exception. This is the first step in creating a parser that can recover and report multiple errors. The default mode remains to throw an exception on first syntax error.
• New functions
• $merge - merge an array of objects into a single object
• $millis - current timestamp in milliseconds since the epoch

1.2.6 Maintenance Release

• fix evaluator when array constructor is the first step in a path expression (issue #63)

1.2.5 Maintenance Release

• Fix $base64encode and $base64decode functions in the browser

1.2.4 Maintenance Release

• Fix an issue running in IE11 and phantom.js (#58)

1.2.3 Maintenance Release

• Fix an issue for a few functions that were not working in ES5 transpiled version (#56)

1.2.2 Maintenance Release

• Update readme.md with API documentation
• Correctly handle null values when executed with a callback (#53)

1.2.1 Maintenance Release

• Generate ES5 compatible version of jsonata.js (jsonata-es5.js & jsonata-es5.min.js) using Babel
  • use the -es5 version if you need to support older browsers or phantom.js
• New functions $base64encode & base64decode
• Fix formatting of inserts in error messages

1.2.0 Milestone Release

• New syntax to specify order of query results
• Support for asynchronous extension functions - callbacks and promises
• New functions
  • $floor - numeric rounding down
  • $ceil - numeric rounding up
  • $round - numeric round half to even
  • $abs - numeric absolute value
  • $power - numeric power function
  • $sqrt - square root
  • $random - generate random number
  • $now - current timestamp
  • $filter - filter array with predicate function
  • $sort - sort array with comparator function
  • $reverse - reverse contents of array
  • $shuffle - shuffle contents of array into random order
  • $zip - convolves (zips) multiple arrays into an array of tuples (nested arrays)
  • $each - generate array from object by applying function to key/value pairs
  • $sift - sift contents of object with predicate function
• The following (previously undocumented) functions have been modified to align them with other functions
  • $map - apply a function to all values in an array
  • $reduce - apply a function to aggregate (fold) all values in an array

1.1.1 Maintenance Release

• fix chaining operator for falsy inputs
• fix tokenizer regression for name tokens that start with "in" and "or"
• Make minified version appear in npm
• Enforce eqeqeq rule in JSONata (#41)
• fix regression: some instances of divide token were incorrectly parsed as start of regex

1.1.0 Milestone Release

• New syntax to create regular expressions
• Enhanced $split function to support regex parameter
• New functions
  • $contains - tests existence of string/regex in a string
  • $match - returns an object representing matches against a regex
  • $replace - replaces occurrences of a substring or regex in a string
  • $trim - removes excessive whitespace in a string
• Function chaining operator ~>
  • allows multiple functions to be applied without excessive nesting
• Context substitutable function parameters
  • allows functions to implicitly operate on the context value
• Function signature syntax
  • to support runtime validation of function arguments
• Errors now have error codes
  • messages maintained in separate catalog