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cl-ellipsis

1.0.0 • Public • Published

cl-ellipsis

Ellipsis DSL for node, construct something like a1,a2, ..., an

Build Status Coverage Status

install

npm i cl-ellipsis --save

usage

expand number list

Expand a list by writing ellipsis.

  • normaly

1, 2, ..., 5 => 1, 2, 3, 4, 5

2, ..., 5 => 2, 3, 4, 5

2, 4, ..., 7 => 2, 4, 6, 7

  • only consider at most two elements before ellipsis

-10, 1, 2, ..., 5 => -10, 1, 2, 3, 4, 5

-10, 2, 4, ..., 7 => -10, 2, 4, 6, 7

  • code example
let pattern = require('cl-ellipsis');
let expand = pattern.expand;
 
let t1 = expand([1, 2, 3, '...', 9]); 
console.log(t1);// [1, 2, 3, 4, 5, 6, 7, 8, 9]
 
let t2 = expand([1, 4, 2, '...', -3]);
console.log(t2);// [1, 4, 2, 0, -2, -3]
  • you can use more than one ellipsises

You can use more than one ellipsises in one array, the ellipsises will be reduced one by one.

4, 6, ..., 9, ..., 12 => 4, 6, 8, 9, ..., 12 => 4, 6, 8, 9, 10, 11, 12

code example

let pattern = require('cl-ellipsis');
let expand = pattern.expand;
 
let t1 = expand([4, 6, '...', 9, '...', 12]); 
console.log(t1);// [4, 6, 8, 9, 10, 11, 12]
  • you can just use string instead of array
let pattern = require('cl-ellipsis');
 
let ret = expand('1 2 ... 6');
console.log(ret); // [1, 2, 3, 4, 5, 6]
  • you can mix array
let pattern = require('cl-ellipsis');
let expand = pattern.expand;
 
let t1 = expand(['a', null, 6, '...', 9]); 
console.log(t1);// ['a', null, 7, 8, 9]

expand array

It's almost the same with number list, but point out which array. See the code:

let pattern = require('cl-ellipsis');
let expand = pattern.expand;
 
let A = [3, 5, 2, 9, 0, 20, 38, -1, -20];
let ret = expand([-1, tagList([2, 4, '...', 7], A), 9]);
console.log(ret); // [-1, 2, 0, 38, -1, 9]

reduce

  • example
let pattern = require('cl-ellipsis');
 
let E = pattern.E;
 
let add = (a, b) => a + b;
 
let ret = E(add, [1, 2, 4, '...', 9]);
console.log(ret); // 30

In the code, E(add, [1, 2, 4, '...', 9]) means 1 + 2 + 4 + ... + 9

E(add, [1, 2, 4, '...', 9]), first, expand [1, 2, 4, '...', 9], then use add operation on the list.

Readme

Keywords

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Install

npm i cl-ellipsis

Repository

github.com/LoveKino/cl-ellipsis

Homepage

github.com/LoveKino/cl-ellipsis#readme

Weekly Downloads

5

Version

1.0.0

License

MIT

Last publish

Collaborators

  • ddchen
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