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Showing content from https://github.com/jsonquerylang/jsonquery/commit/f252a598b6efc127a6104046f42587bdc7d73c65 below:

document function `substring` and change it into a standalone fu… · jsonquerylang/jsonquery@f252a59 · GitHub

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 @@ -179,6 +179,10 @@ <h1>JSON Query</h1>

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 <a href="https://github.com/jsonquerylang/jsonquery/blob/main/reference/functions.md#split"

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 target="_blank"><code>split(text, separator)</code></a>

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 </li>

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 <li>

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 <a href="https://github.com/jsonquerylang/jsonquery/blob/main/reference/functions.md#substring"

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 target="_blank"><code>substring(text, start, end)</code></a>

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 </li>

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 <li>

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 <a href="https://github.com/jsonquerylang/jsonquery/blob/main/reference/functions.md#uniq"

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 target="_blank"><code>uniq()</code></a>


 @@ -480,7 +484,7 @@ <h3 class="title">Debugger</h3>

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 </div>

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 <script type="module">

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 import { jsonquery, stringify, parse, compile } from 'https://cdn.jsdelivr.net/npm/@jsonquerylang/jsonquery@4/lib/jsonquery.js'

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 import { jsonquery, stringify, parse, compile } from '../lib/jsonquery.js'

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 import { Formatter, FracturedJsonOptions } from 'https://cdn.jsdelivr.net/npm/fracturedjsonjs/+esm'

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 window.jsonquery = { jsonquery, stringify, parse, compile }

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 @@ -531,6 +531,32 @@ jsonquery(data, 'split("a,b,c", ",")')

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 // ["a", "b", "c"]

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```

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+
 ## substring

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+
 Extract a substring from a string. When `end` is not provided, the length of the string will be used as `end`.

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 ```text

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 substring(text, start)

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 substring(text, start, end)

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 ```

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+
 Examples:

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 ```js

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 const events = [

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 {"type": "start", "time": "2024-11-06 23:14:00" },

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 {"type": "initialize", "time": "2025-11-08 09:00:00" },

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 {"type": "end", "time": "2025-11-24 10:27:00" }

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 ]

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 jsonquery(events, 'map(substring(.time, 0, 10))')

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 // [

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 // "2024-11-06",

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 // "2025-11-08",

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 // "2025-11-24"

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 // ]

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 ```

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 ## uniq

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 Create a copy of an array where all duplicates are removed.

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 @@ -210,7 +210,9 @@ export const functions: FunctionBuildersMap = {

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 separator !== undefined ? text.split(separator) : text.trim().split(/\s+/)

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),

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-
 substring: (start: number, end: number) => (data: string) => data.slice(Math.max(start, 0), end),

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 substring: buildFunction((text: string, start: number, end?: number) =>

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 text.slice(Math.max(start, 0), end)

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 ),

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 uniq:

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 () =>

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 @@ -543,42 +543,42 @@

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 "category": "substring",

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 "description": "should get a substring of a string with a start index",

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 "input": "123456",

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 "query": ["substring", 3],

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 "query": ["substring", ["get"], 3],

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 "output": "456"

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},

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 "category": "substring",

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 "description": "should get a substring of a string with a start and end index",

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 "input": "123456",

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 "query": ["substring", 2, 4],

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 "input": { "value": "123456" },

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 "query": ["substring", ["get", "value"], 2, 4],

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 "output": "34"

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},

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 "category": "substring",

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 "description": "should get a substring of a string with a start exceeding the string length",

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 "input": "123456",

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 "query": ["substring", 10],

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 "input": null,

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 "query": ["substring", "123456", 10],

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 "output": ""

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},

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 "category": "substring",

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 "description": "should get a substring of a string with an end exceeding the string length",

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 "input": "123456",

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 "query": ["substring", 0, 10],

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 "input": null,

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 "query": ["substring", "123456", 0, 10],

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 "output": "123456"

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},

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 "category": "substring",

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 "description": "should get a substring of a string with an end index smaller than the start index",

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 "input": "123456",

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 "query": ["substring", 3, 0],

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 "input": null,

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 "query": ["substring", "123456", 3, 0],

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 "output": ""

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},

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 "category": "substring",

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 "description": "should get a substring of a string with a negative start index",

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 "input": "123456",

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 "query": ["substring", -2],

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 "input": null,

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 "query": ["substring", "123456", -2],

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 "output": "123456"

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},

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