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799Creating Arrays with Array Literals
800Zero-Based Indexing
801Reading Elements with Bracket Notation
802Setting Elements by Index
803The Length Property
804Sparse Arrays and Empty Slots
805Accessing Out-of-Bounds Indices
806Dynamic Length Changes
807Negative Indices and Non-Integer Keys
808Trailing Commas in Array Literals
809Multi-Dimensional Arrays
810What 'Mutating' Means for Arrays
811push() and pop(): Adding and Removing from the End
812unshift() and shift(): Adding and Removing from the Start
813splice(): The Swiss Army Knife Method
814splice() for Removing Elements
815splice() for Inserting Elements
816splice() for Replacing Elements
817reverse(): Flipping Array Order
818sort(): Sorting Arrays In Place
819sort() with Comparator Functions
820fill(): Replacing Elements with a Static Value
821copyWithin(): Copying Elements Within the Same Array
822The Return Values of Mutating Methods
823Why Mutation Can Be Dangerous
824When to Prefer Immutable Alternatives
825Understanding Mutating vs Non-Mutating Methods
826slice() for Extracting Array Portions
827concat() for Combining Arrays
828join() to Convert Arrays to Strings
829indexOf() and lastIndexOf() for Finding Elements
830includes() for Membership Testing
831toString() and toLocaleString() for Display
832with() for Immutable Index Updates
833toReversed() for Immutable Reversal
834toSorted() for Immutable Sorting
835toSpliced() for Immutable Splicing
836Shallow vs Deep Copying with Non-Mutating Methods
837When to Prefer Non-Mutating Methods
838Array.of for Creating Arrays from Arguments
839Array Constructor vs Array.of
840Array.from with Array-Like Objects
841Array.from with Iterables
842The Mapping Function in Array.from
843Setting 'this' in Array.from's Map Function
844Creating Range Arrays with Array.from
845When to Use Array.from vs Spread

799Creating Arrays with Array Literals
800Zero-Based Indexing
801Reading Elements with Bracket Notation
802Setting Elements by Index
803The Length Property
804Sparse Arrays and Empty Slots
805Accessing Out-of-Bounds Indices
806Dynamic Length Changes
807Negative Indices and Non-Integer Keys
808Trailing Commas in Array Literals
809Multi-Dimensional Arrays
810What 'Mutating' Means for Arrays
811push() and pop(): Adding and Removing from the End
812unshift() and shift(): Adding and Removing from the Start
813splice(): The Swiss Army Knife Method
814splice() for Removing Elements
815splice() for Inserting Elements
816splice() for Replacing Elements
817reverse(): Flipping Array Order
818sort(): Sorting Arrays In Place
819sort() with Comparator Functions
820fill(): Replacing Elements with a Static Value
821copyWithin(): Copying Elements Within the Same Array
822The Return Values of Mutating Methods
823Why Mutation Can Be Dangerous
824When to Prefer Immutable Alternatives
825Understanding Mutating vs Non-Mutating Methods
826slice() for Extracting Array Portions
827concat() for Combining Arrays
828join() to Convert Arrays to Strings
829indexOf() and lastIndexOf() for Finding Elements
830includes() for Membership Testing
831toString() and toLocaleString() for Display
832with() for Immutable Index Updates
833toReversed() for Immutable Reversal
834toSorted() for Immutable Sorting
835toSpliced() for Immutable Splicing
836Shallow vs Deep Copying with Non-Mutating Methods
837When to Prefer Non-Mutating Methods
838Array.of for Creating Arrays from Arguments
839Array Constructor vs Array.of
840Array.from with Array-Like Objects
841Array.from with Iterables
842The Mapping Function in Array.from
843Setting 'this' in Array.from's Map Function
844Creating Range Arrays with Array.from
845When to Use Array.from vs Spread

Lesson 829 of 2,723·19. ArraysPro lesson

indexOf() and lastIndexOf() for Finding Elements

Search for element positions in an array using indexOf() and lastIndexOf().

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