53 lines
1.2 KiB
Markdown
53 lines
1.2 KiB
Markdown
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node-parse-numeric-range
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========================
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Parses expressions like 1-10,20-30. Returns an energetic (as opposed to lazy) array.
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## Supported Expressions
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Comprehensive supported expression examples:
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| Expression | result |
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|:----------:|:------------:|
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| | [] |
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| 1 | [1] |
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| 1,2 | [1,2] |
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| -10 | [-10] |
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| -3,-3 |[-3, -3] |
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| -1-2,-2 |[-1,0,1,2,-2] |
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| -1--2 |[-1,-2] |
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| -1..2,-2 |[-1,0,1,2,-2] |
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| -1...3,-2 |[-1,0,1,2,-2] |
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| 1⋯3 |[1,2] |
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| 1…3 |[1,2] |
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| 1‥3 |[1,2,3] |
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What's this useful for? Well, letting users input these sorts of things and then
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making them programmatically useful.
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## Usage
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First, `npm install parse-numeric-range`.
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```javascript
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const rangeParser = require("parse-numeric-range");
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const numbers = rangeParser("4,6,8-10,12,14..16,18,20...23");
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console.log(
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`The first ${numbers.length} composite numbers are: ${numbers.join(", ")}`,
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);
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```
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### ES6
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```jsx
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import rangeParser from "parse-numeric-range";
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const numbers = rangeParser("4,6,8-10,12,14..16,18,20...23");
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console.log(
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`The first ${numbers.length} composite numbers are: ${numbers.join(", ")}`,
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);
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```
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