associative-array

A combination of Map and Array that maintains key ordering.

Usage

var AssociativeArray = require('associative-array');
 
var arr = new AssociativeArray();
 
arr.push('key', {value: 'value'});
arr.push('key2', {value: 'value2'});
arr.push('key3', {value: 'value3'});
 
arr.has('key'); //true
arr.has('beans'); //false
 
arr.length; //3
 
arr.push('key3', {value: 'value3 again'});
 
arr.length; //3
 
arr.map(function(val, idx, key) {
  return idx + ':' + val.value + ':' key;
}); //['0:value:key', '1:value2:key2', '2:value3:key3']
 
 
arr.remove('key2');
 
arr.map(function(val, idx, key) {
  return idx + ':' + val.value + ':' key;
}); //['0:value:key', '1:value3:key3']

API

AssociativeArray(size)

Construct a new AssociativeArray.

• size int - the initial size of the underlying Array.

AssociativeArray.length

The number of items currently stored in the AssociativeArray.

AssociativeArray.push(key, value)

Push a new key, value pair onto the AssociativeArray. Will not affect the AssociativeArray if key is already in it.

• key mixed - the key to associate with value. Can be any key supported by Map.
• value mixed - the value to store
• returns this

AssociativeArray.pop()

Pop the last value off of the AssociativeArray.

• returns mixed - the removed last value.

AssociativeArray.has(key)

Check whether the AssociativeArray contains key.

• key mixed - the key to look for
• returns boolean

AssociativeArray.get(key)

Get the value associated with key.

• key mixed - the key to look for
• returns mixed

AssociativeArray.getIdx(index)

Get the value stored at index.

• index int - the index to look up
• returns mixed

AssociativeArray.first()

Get the first value.

• returns mixed

AssociativeArray.last()

Get the last value.

• returns mixed

AssociativeArray.set(key, value, index)

Set a key, value pair at a particular index in the AssociativeArray. Replaces any value that previously occupied that index. If key is already present in the AssociativeArray, value will replace the old value if index matches the current index of key, or if index is not supplied. Otherwise, set() will not affect the AssociativeArray if key is already in it. Omitting index makes this equivalent to AssociativeArray.push(key, value) when key is not already present in the AssociativeArray.

• key mixed - the key to associate with value. Can be any key supported by Map.
• value mixed - the value to store
• index int - the index to store value at
• returns this

AssociativeArray.reset()

Clear all values from the AssociativeArray.

• returns this

AssociativeArray.forEach(fn)

Iterate over the values in the AssociativeArray.

• fn function - the callback to execute with each value, index, and key. If fn returns false, the loop will be broken.
• returns this

AssociativeArray.map(fn)

Map the values in the AssociativeArray to a plain Array.

• fn function - the callback to execute with each value, index, and key.
• returns array

AssociativeArray.filter(fn)

Return a plain Array of values in the AssociativeArray which pass the fn test.

• fn function - the callback to test each value with. Should return boolean.
• returns array

AssociativeArray.remove(key)

Remove the value associated with key from the AssociativeArray.

• key mixed - the key to look for
• returns mixed - the removed value