map-deque

A map with ordered insertion and removal

MapDeque is used to get constant time ordered insertion and removal (like a queue or a stack), and also provide constant-time lookup by key (like a map).

Usage

npm install map-deque

var MapDeque = require('map-deque')
var md = new MapDeque()
md.push('key', 'value')
md.get('key') // => "value"
md.shift() // removes 'key'

md.push(key, value)

Adds the given key and value to the end of the MapDeque.

If a value already exists with this key, an error is thrown.

Note that the key is converted to a string, similar to var o = {}; o[key] = value.

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md.unshift(key, value)

Adds the given key and value to the beginning of the MapDeque.

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md.shift([entry])

Shifts a value off of the beginning of the MapDeque, and returns its value. If entry is true, the returned value will be an object containing { key: <key>, value: <value> }.

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md.pop([entry])

Shifts a value off of the end of the MapDeque, and returns its value. If entry is true, the returned value will be an object containing { key: <key>, value: <value> }.

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md.get(key)

Returns the value associated with key.

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md.has(key)

Returns true if there is a value associated with key, otherwise false.

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md.length

The number of values in the MapDeque.