Tango
  • Introduction
  • Getting Started
    • Summary
    • From me, the Developer
    • What is Tango?
    • Where to start?
  • Installation
    • Based on NuGet
    • Manually
  • Fundamentals
    • Introduction
    • Using Pattern Matching
    • Option values
    • Either values
    • From void to Unit
    • Func and Action
    • Chainable operations in a Continuation flow
    • Currying and Partial Application
  • Functional
    • Introduction
    • Currying
    • Partial Application
    • Functional Extensions
    • QuickCast to Delegates
  • Operations
    • Introduction
    • Operations with Booleans
    • Operations with Integers
    • Operations with Decimals
    • Operations with Doubles
    • Operations with Strings
  • Types
    • Introduction
    • Unit
    • Option<T>
    • Either<TLeft, TRight>
    • Continuation<TFail, TSuccess>
  • Modules
    • Introduction
    • Option
      • Apply
      • AsEnumerable
      • Bind
      • Count
      • Exists
      • Filter
      • Fold
      • FoldBack
      • Iterate
      • Map
      • OfNullable
      • ToArray
      • ToList
      • ToNullable
    • Either
      • Exists
      • Iterate
      • Fold
      • FoldBack
      • Map
      • Swap
      • ToTuple
    • Continuation
      • AsContinuation
      • Resolve
      • Reject
      • All
    • Collection
      • Append
      • Choose
      • ChunkBySize
      • Collect
      • CompareWith
      • CountBy
      • Concat
      • Distinct
      • Empty
      • Exists
      • Exists2
      • Filter
      • FindIndex
      • Fold
      • Fold2
      • FoldBack
      • FoldBack2
      • ForAll
      • ForAll2
      • ForAll3
      • Head
      • HeadAndTailEnd
      • Range
      • Generate
      • Initialize
      • Iterate
      • Iterate2
      • IterateIndexed
      • IterateIndexed2
      • Map
      • Map2
      • Map3
      • MapIndexed
      • MapIndexed2
      • MapIndexed3
      • Partition
      • Permute
      • Pick
      • Reduce
      • ReduceBack
      • Replicate
      • Scan
      • Scan2
      • ScanBack
      • ScanBack2
      • Tail
      • TryFind
      • TryPick
      • Unzip
      • Unzip3
      • Zip
      • Zip3
  • Extensions
    • Introduction
    • Enum Extensions
    • EqualityComparer Builder
    • Modules as Extensions
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  1. Modules
  2. Collection

Exists

Tests if any element of the collection satisfies the given predicate.

If any application returns true then the overall result is true and no further elements are tested.

Otherwise, false is returned.

Parameters

Returns

Func<T, bool> predicate

IEnumerable<T> source

bool

Usage

Checking if the collection contains an even number

//IEnumerable<int> source = { 1, 3, 5, 7, 8, 9, 11 }
bool result = source.Exists(value => value % 2 == 0);

//result = true
PreviousEmptyNextExists2

Last updated 5 years ago

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