Basic Examples (2) 

Create keys by mapping symbolic function f over a list of strings:

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Create an Association between hashes of the values and the values themselves:

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Scope (2) 

ValueMap works on the first level of expressions:

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Work on lower levels by using Map in conjunction with ValueMap:

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ValueMap works with Query on datasets:

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It also works with implicit Query operations:

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Applications (1) 

Create row headers for the Paul Revere social network based on the name of the person involved:

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Properties and Relations (1) 

One can accomplish much the same thing as ValueMap with the following code that uses AssociationMap; however, it is quite cumbersome:

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Possible Issues (2) 

If the key generated from application of the function is not unique, the value for that key will be the last value encountered that generated the key:

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Sometimes, this deletion of key-value pairs with duplicate keys may be exactly what is desired, however:

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ValueMap will not work properly on datasets without the use of Query:

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Neat Examples (1) 

Use ValueMap to create a custom index on the hash of a function of two columns of a dataset and then use the index to swiftly retrieve information:

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