# QueryReduce

This function reduces the query to a single value.

## Method Signature

```
QueryReduce(query=[query], callback=[function:BiFunction], initialValue=[any])
```

### Arguments

| Argument       | Type                  | Required | Description                                                                                                                                                                                                                                         | Default |
| -------------- | --------------------- | -------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------- |
| `query`        | `query`               | `true`   | The query to iterate over                                                                                                                                                                                                                           |         |
| `callback`     | `function:BiFunction` | `true`   | <p>The function to invoke for each item. The function will be passed 4 arguments: the accumulator, the current item, the current index, and the query. You can alternatively pass a Java Predicate which will only receive the first 2<br>args.</p> |         |
| `initialValue` | `any`                 | `true`   | The initial value to use for the reduction                                                                                                                                                                                                          |         |

## Examples

### Reduce column to total

Sum one query column

[Run Example](https://try.boxlang.io/?code=eJxtj8FqwkAQhs%2FZp%2FjZU0KX0lZ6qSj4AE2g1FMpstGJLugmncw2BMm7d6NepDkNfPN%2F8zMVByctFvgJxH1OXQpdjczYUx28aAP9a3l7sGycF9oTR%2FQFlZxVklyjGm%2FQtmmO1Goz0psa8fOrSgbzL9w4T9PCbDLfCtuuJGY3YbxERX0jmyupxR431d1LH7QLW0pxpQYpVr6HNZdRIsNiidjGJIE9LB5QPq7ei3X%2BOVeDwdN4t2MnVARpgqS4K4nLP6JPXqo%3D)

```java
fruits = queryNew( "fruit,amount", "varchar,integer", [ 
	{
		"fruit" : "apples",
		"amount" : 15
	},
	{
		"fruit" : "pineapples",
		"amount" : 3
	},
	{
		"fruit" : "strawberries",
		"amount" : 32
	}
] );
total_fruits = queryReduce( fruits, ( Any a, Any b ) => {
	return a + b.AMOUNT;
}, 0 );
writeOutput( total_fruits );

```

Result: 50

### Additional Examples

```java
people = QueryNew( "name,dob,age", "varchar,date,int", [ 
	[
		"Susi",
		CreateDate( 1970, 1, 1 ),
		0
	],
	[
		"Urs",
		CreateDate( 1995, 1, 1 ),
		0
	],
	[
		"Fred",
		CreateDate( 1960, 1, 1 ),
		0
	],
	[
		"Jim",
		CreateDate( 1988, 1, 1 ),
		0
	]
] );
date = createDateTime( 2016, 3, 13, 17, 0, 0 );
totalAge = queryreduce( people, ( Any age = 0, Any row, Any rowNumber, Any recordset ) => {
	return age + DateDiff( "yyyy", recordset.DOB, date );
} );
writeDump( totalAge );

```

## Related

* [QueryAddColumn](https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/query/queryaddcolumn)
* [QueryAddRow](https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/query/queryaddrow)
* [QueryAppend](https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/query/queryappend)
* [QueryClear](https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/query/queryclear)
* [QueryColumnArray](https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/query/querycolumnarray)
* [QueryColumnCount](https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/query/querycolumncount)
* [QueryColumnData](https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/query/querycolumndata)
* [QueryColumnExists](https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/query/querycolumnexists)
* [QueryColumnList](https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/query/querycolumnlist)
* [QueryCurrentRow](https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/query/querycurrentrow)
* [QueryDeleteColumn](https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/query/querydeletecolumn)
* [QueryDeleteRow](https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/query/querydeleterow)
* [QueryEach](https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/query/queryeach)
* [QueryEvery](https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/query/queryevery)
* [QueryFilter](https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/query/queryfilter)
* [QueryGetCell](https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/query/querygetcell)
* [QueryGetResult](https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/query/querygetresult)
* [QueryInsertAt](https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/query/queryinsertat)
* [QueryKeyExists](https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/query/querykeyexists)
* [QueryMap](https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/query/querymap)
* [QueryNew](https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/query/querynew)
* [QueryNone](https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/query/querynone)
* [QueryPrepend](https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/query/queryprepend)
* [QueryRecordCount](https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/query/queryrecordcount)
* [QueryRecordCount](https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/query/queryrecordcount)
* [QueryRegisterFunction](https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/query/queryregisterfunction)
* [QueryReverse](https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/query/queryreverse)
* [QueryRowData](https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/query/queryrowdata)
* [QueryRowSwap](https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/query/queryrowswap)
* [QuerySetCell](https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/query/querysetcell)
* [QuerySetRow](https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/query/querysetrow)
* [QuerySlice](https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/query/queryslice)
* [QuerySome](https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/query/querysome)
* [QuerySort](https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/query/querysort)


---

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