Method ZipMap
| Edit this pageZipMap<TSource, TResult>(IEnumerable<TSource>, Func<TSource, TResult>)
Applies a function to each element in a sequence and returns a sequence of tuples containing both the original item as well as the function result.
Declaration
public static IEnumerable<(TSource item, TResult result)> ZipMap<TSource, TResult>(this IEnumerable<TSource> source, Func<TSource, TResult> selector)Parameters
| Type | Name | Description |
|---|---|---|
| IEnumerable<TSource> | source | A sequence of values to invoke a transform function on |
| Func<TSource, TResult> | selector | A transform function to apply to each source element |
Returns
| Type | Description |
|---|---|
| IEnumerable<(TSource item, TResult result)> | An IEnumerable<T> whose elements are a tuple of the original element and the item returned
from calling the |
Type Parameters
| Name | Description |
|---|---|
| TSource | The type of the elements of source |
| TResult | The type of the value returned by selector |
Remarks
This operator uses deferred execution and streams its results.
Examples
The following code example demonstrates how to generate a sequence of values and a projection of that value using ZipMap.
var sequence = new[] { "one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten", };
// Filter a sequence based on a leading value
var result = sequence
.ZipMap(x => x.ToString().Length);
Console.WriteLine(
"[" +
string.Join(", ", result) +
"]");
// This code produces the following output:
// [(one, 3), (two, 3), (three, 5), (four, 4), (five, 4), (six, 3), (seven, 5), (eight, 5), (nine, 4), (ten, 3)]
Exceptions
| Type | Condition |
|---|---|
| ArgumentNullException |
|