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Fixed rendering error on $..book[?(@.price <= $['expensive'])] in R…
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…EADME.md (#967)

Add code blocks and fix error that says Misplaced @ because of two dollar signs ($) in a JsonPath expression in Path Examples section for `$..book[?(@.price <= $['expensive'])]`
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lulunac27a authored Jan 2, 2024
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Expand Up @@ -85,41 +85,42 @@ Functions
Functions can be invoked at the tail end of a path - the input to a function is the output of the path expression.
The function output is dictated by the function itself.

| Function | Description | Output type |
|:----------|:-------------------------------------------------------------------------------------|:---------------------|
| min() | Provides the min value of an array of numbers | Double |
| max() | Provides the max value of an array of numbers | Double |
| avg() | Provides the average value of an array of numbers | Double |
| stddev() | Provides the standard deviation value of an array of numbers | Double |
| length() | Provides the length of an array | Integer |
| sum() | Provides the sum value of an array of numbers | Double |
| keys() | Provides the property keys (An alternative for terminal tilde `~`) | `Set<E>` |
| concat(X) | Provides a concatinated version of the path output with a new item | like input |
| append(X) | add an item to the json path output array | like input |
| first() | Provides the first item of an array | Depends on the array |
| last() | Provides the last item of an array | Depends on the array |
| index(X) | Provides the item of an array of index: X, if the X is negative, take from backwards | Depends on the array |
| Function | Description | Output type |
|:------------|:-------------------------------------------------------------------------------------|:---------------------|
| `min()` | Provides the min value of an array of numbers | Double |
| `max()` | Provides the max value of an array of numbers | Double |
| `avg()` | Provides the average value of an array of numbers | Double |
| `stddev()` | Provides the standard deviation value of an array of numbers | Double |
| `length()` | Provides the length of an array | Integer |
| `sum()` | Provides the sum value of an array of numbers | Double |
| `keys()` | Provides the property keys (An alternative for terminal tilde `~`) | `Set<E>` |
| `concat(X)` | Provides a concatinated version of the path output with a new item | like input |
| `append(X)` | add an item to the json path output array | like input |
| `first()` | Provides the first item of an array | Depends on the array |
| `last()` | Provides the last item of an array | Depends on the array |
| `index(X)` | Provides the item of an array of index: X, if the X is negative, take from backwards | Depends on the array |

Filter Operators
-----------------

Filters are logical expressions used to filter arrays. A typical filter would be `[?(@.age > 18)]` where `@` represents the current item being processed. More complex filters can be created with logical operators `&&` and `||`. String literals must be enclosed by single or double quotes (`[?(@.color == 'blue')]` or `[?(@.color == "blue")]`).

| Operator | Description |
| :----------------------- | :-------------------------------------------------------------------- |
| == | left is equal to right (note that 1 is not equal to '1') |
| != | left is not equal to right |
| < | left is less than right |
| <= | left is less or equal to right |
| > | left is greater than right |
| >= | left is greater than or equal to right |
| =~ | left matches regular expression [?(@.name =~ /foo.*?/i)] |
| in | left exists in right [?(@.size in ['S', 'M'])] |
| nin | left does not exists in right |
| subsetof | left is a subset of right [?(@.sizes subsetof ['S', 'M', 'L'])] |
| anyof | left has an intersection with right [?(@.sizes anyof ['M', 'L'])] |
| noneof | left has no intersection with right [?(@.sizes noneof ['M', 'L'])] |
| size | size of left (array or string) should match right |
| empty | left (array or string) should be empty |
| `==` | left is equal to right (note that 1 is not equal to '1') |
| `!=` | left is not equal to right |
| `<` | left is less than right |
| `<=` | left is less or equal to right |
| `>` | left is greater than right |
| `>=` | left is greater than or equal to right |
| `=~` | left matches regular expression [?(@.name =~ /foo.*?/i)] |
| `in` | left exists in right [?(@.size in ['S', 'M'])] |
| `nin` | left does not exists in right |
| `subsetof` | left is a subset of right [?(@.sizes subsetof ['S', 'M', 'L'])] |
| `anyof` | left has an intersection with right [?(@.sizes anyof ['M', 'L'])] |
| `noneof` | left has no intersection with right [?(@.sizes noneof ['M', 'L'])] |
| `size` | size of left (array or string) should match right |
| `empty` | left (array or string) should be empty |


Path Examples
Expand Down Expand Up @@ -169,23 +170,23 @@ Given the json

| JsonPath | Result |
|:-------------------------------------------------------------------| :----- |
| $.store.book[*].author | The authors of all books |
| $..author | All authors |
| $.store.* | All things, both books and bicycles |
| $.store..price | The price of everything |
| $..book[2] | The third book |
| $..book[-2] | The second to last book |
| $..book[0,1] | The first two books |
| $..book[:2] | All books from index 0 (inclusive) until index 2 (exclusive) |
| $..book[1:2] | All books from index 1 (inclusive) until index 2 (exclusive) |
| $..book[-2:] | Last two books |
| $..book[2:] | All books from index 2 (inclusive) to last |
| $..book[?(@.isbn)] | All books with an ISBN number |
| $.store.book[?(@.price < 10)] | All books in store cheaper than 10 |
| $..book[?(@.price <= $['expensive'])] | All books in store that are not "expensive" |
| $..book[?(@.author =~ /.*REES/i)] | All books matching regex (ignore case) |
| $..* | Give me every thing
| $..book.length() | The number of books |
| `$.store.book[*].author` | The authors of all books |
| `$..author` | All authors |
| `$.store.*` | All things, both books and bicycles |
| `$.store..price` | The price of everything |
| `$..book[2]` | The third book |
| `$..book[-2]` | The second to last book |
| `$..book[0,1]` | The first two books |
| `$..book[:2]` | All books from index 0 (inclusive) until index 2 (exclusive) |
| `$..book[1:2]` | All books from index 1 (inclusive) until index 2 (exclusive) |
| `$..book[-2:]` | Last two books |
| `$..book[2:]` | All books from index 2 (inclusive) to last |
| `$..book[?(@.isbn)]` | All books with an ISBN number |
| `$.store.book[?(@.price < 10)]` | All books in store cheaper than 10 |
| `$..book[?(@.price <= $['expensive'])]` | All books in store that are not "expensive" |
| `$..book[?(@.author =~ /.*REES/i)]` | All books matching regex (ignore case) |
| `$..*` | Give me every thing
| `$..book.length()` | The number of books |

Reading a Document
------------------
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