https://github.com/dandandan/underscore.js-javascript-list-comprehension

A list comprehension function for Underscore.js
https://github.com/dandandan/underscore.js-javascript-list-comprehension

Last synced: 24 days ago
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A list comprehension function for Underscore.js

• Host: GitHub
• URL: https://github.com/dandandan/underscore.js-javascript-list-comprehension
• Owner: Dandandan
• Created: 2013-07-25T12:57:11.000Z (over 11 years ago)
• Default Branch: master
• Last Pushed: 2013-07-25T14:08:45.000Z (over 11 years ago)
• Last Synced: 2024-11-06T02:42:58.914Z (2 months ago)
• Size: 105 KB
• Stars: 0
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
generator.js

===========================================

A list comprehension function for Underscore.js

List comprehension

First argument is a function that converts the elements that are the result of the  

Other arguments are arrays, or an object with an array v and a guard g

Generate a simple list:

```

_.generate(_.id, ['She'], ['Loves me', 'Hates me'])

  => [['She','loves me'], ['She','hates me']]

```

The simple guard can only access his own value

```

_.generate(_.id, _.range(2), {v:_.range(5), g:_.even}) => [[0,0], [0,2], [0,4], [1,0], [1,2], [1,4]]

```

You can also apply a special guard _g to access other variables as the list is being generated from right to left

```

_.generate(_.id, {v:_.range(5), g_:function(a,b) {return  a===b} }, {v:_.range(5), g:_.even}) 

  => [[0,0], [2,2], [4,4]]

```

Or with more than two arguments, where the index of the second parameter b is the amount of places to the right: 

```

_.generate(_.id, {v:_.range(5), g_:function(a,b) {return  a===b[0] && a===b[1]}},_.range(5), {v:_.range(5), g:_.even}) 

  => [[0,0,0], [2,2,2], [4,4,4]]

```