Inverted-Index

This creates an inverted index object. An inverted index basically maps the contents of a file, i.e words, numbers e.t.c to their location in the file(s). This concept is mainly applied in search engines indexing algorithm to facilitate faster full text searches.

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Getting started

• Install NodeJs
• Install httpster npm install -g httpster
• Clone the repository

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Usage

To run it on node:

• Navigate at your terminal to the root project folder
• Change directory to jasmine/src
• Get to nodeJS environment $ node
• Require the source file and create an instance of the Index module

> var index = require('./invertedIndex');
> var test = new index();

Create the index

The creatIndex methosd takes in a string variable that represents the path to the JSON file that its contents will be to used to create the index.

index.createIndex('../books.json')

Generate index

console.log(index.getIndex())
logs
{ title: [ 0, 1 ],
alice: [ 0 ],
in: [ 0 ],
wonderland: [ 0 ],
text: [ 0, 1 ],
lord: [ 0, 1 ],
 falls: [ 0 ]....

Search index

The search method takes in different arguments and generates their index

console.log(index.searchIndex('Alice'))
logs
[ 0 ]

console.log(searchIndex(['Alice', 'lord', 'falls', 'hole']))
logs
{ alice: [ 0 ], lord: [ 0, 1 ], falls: [ 0 ], hole: [ 0 ] }

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Running the tests

• On your terminal change directory to the root project folder.
• Start the server httpster.
• Navigate to http://localhost:3333/jasmine/SpecRunner.html on your browser to run the tests.