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{"type":"item.completed","item":{"id":"item_0","type":"agent_message","text":"\nA jq program is a \"filter\": it takes an input, and produces an output.\n\n\nFilters can be combined in various ways - you can pipe the output of\none filter into another filter, or collect the output of a filter\ninto an array.\n\n\nSome filters produce multiple results, for instance there's one that\nproduces all the elements of its input array.\n\n\nNumbers in jq are internally represented by their IEEE754 double\nprecision approximation.\n\n\nThe simplest *useful* filter has the form `.foo`. When given a\nJSON object (aka dictionary or hash) as input, `.foo` produces\nthe value at the key \"foo\" if the key is present, or null otherwise.\n\n\nWhen the index value is an integer, `.[]` can index\narrays. Arrays are zero-based, so `.[2]` returns the third\nelement.\n\n\nThe `.[:]` syntax can be used to return a\nsubarray of an array or substring of a string.\n\n\nA `#` character (not part of a string) starts a comment.\n\n\nInside a string, you can put an expression inside parens\nafter a backslash. Whatever the expression returns will be\ninterpolated into the string.\n\n\nThe | operator combines two filters by feeding the output(s) of\nthe one on the left into the input of the one on the right.\n\n\nYou can give a filter a name using \"def\" syntax:\n\n\nErrors can be caught by using `try EXP catch EXP`.\n\n\nThe expression 'a == b' will produce 'true' if the results of evaluating\na and b are equal (that is, if they represent equivalent JSON values) and\n'false' otherwise.\n\n\nThe operator `+` takes two filters, applies them both\nto the same input, and adds the results together.\n\n\njq supports the normal Boolean operators `and`, `or`, `not`.\n\n\n`if A then B else C end` will act the same as `B` if `A`\nproduces a value other than false or null, but act the same as\n`C` otherwise.\n\n\njq has a syntax for named lexical labels to\nbreak or go (back) to:\n\n\nThe `reduce` syntax allows you to combine all of the results of\nan expression by accumulating them into a single answer.\n\n\nThe `recurse(f)` function allows you to search through a\nrecursive structure, and extract interesting data from all\nlevels.\n\n\njq lets you define variables using\n`expression as $variable`.\n\n\nArguments are passed as _filters_ (functions with no\narguments), _not_ as values.\n\n\nIt is also possible to define functions in jq, although this\nis a feature whose biggest use is defining jq's standard library\n\n\nThe destructuring alternative operator provides a concise mechanism\nfor destructuring an input that can take one of several forms.\n\n\n`paths` outputs the paths to all the elements in its input\n\n\nThe builtin function `getpath` outputs the values in `.` found\nat each path in `PATHS`.\n\n\nMost users will want to use modification assignment operators,\nsuch as `|=` or `+=`, rather than `=`.\n\n\nAny filter may be used on the\nleft-hand side of an equals - whichever paths it selects from the\ninput will be where the assignment is performed.\n\n\nFor any filter `f`, `map(f)` and `map_values(f)` apply `f`\nto each of the values in the input array or object, that is,\nto the values of `.[]`.\n\n\nThe `sort` functions sorts its input, which must be an\narray.\n\n\nThese functions convert between an object and an array of\nkey-value pairs.\n\n\nThe builtin function `has` returns whether the input object\nhas the given key, or the input array has an element\nat the given index.\n\n\nThe `split` function splits an input string on the separator argument.\n\n\nThe `tojson` and `fromjson` builtins dump values as JSON texts\nor parse JSON texts into values, respectively.\n\n\njq uses the\n[Oniguruma regular expression library](https://github.com/kkos/oniguruma/blob/master/doc/RE),\n\n\njq provides some basic date handling functionality, with some\nhigh-level and low-level builtins.\n\n\nTwo builtins functions\nare provided for this, `input` and `inputs`, that read from\nthe same sources\n\n\nThe `debug` builtin can have as a side-effect the production of one or more messages on stderr.\n\n\nWith the `--stream` option jq can parse input texts in a streaming\nfashion, allowing jq programs to start processing large JSON texts\nimmediately rather than after the parse completes.\n\n\nThe given `exit_code` (defaulting to `5`) will be jq's\nexit status.\n\n\njq's output values are always\noutput as JSON texts on `stdout`.\n\n\njq supports the same set of datatypes as JSON - numbers,\nstrings, booleans, arrays, objects (which in JSON-speak are\nhashes with only string keys), and \"null\".\n\n\n\n\n\n"}}
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