arraylist

package
v0.1.3 Latest Latest
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 Go to latest Published: Jul 3, 2024 License: Apache-2.0 Imports: 3 Imported by: 0

Documentation

Overview

Package arraylist provides a resizable array implementation.

Index

Examples

Constants

This section is empty.

Variables

This section is empty.

Functions

This section is empty.

Types

type ArrayList 

type ArrayList[T any] []T

ArrayList is a generic type representing a list of elements

Example 
al := ArrayList[int]{1, 2, 3, 4, 5}
fmt.Println(al) 

Output:

[1 2 3 4 5]

func Of 

func Of[T any](elements ...T) ArrayList[T]

Of creates a new ArrayList with the provided elements.

Example 
list := Of(1, 2, 3, 4, 5)
fmt.Println(list)

Output:

[1 2 3 4 5]

func Repeat 

func Repeat[T any](element T, count int) ArrayList[T]

Repeat creates a new ArrayList by repeating the specified element for the given count.

Example 
repeated := Repeat("hello", 3)
fmt.Println(repeated)

Output:

[hello hello hello]

func (ArrayList[T]) At 

func (l ArrayList[T]) At(index int) (element T, err error)

At returns the element at the specified index in the array list.

Example 
list := ArrayList[int]{1, 2, 3, 4, 5}
element, _ := list.At(2)
fmt.Println(element)
element, _ = list.At(-1)
fmt.Println(element)
_, err := list.At(10)
fmt.Println(err)

Output:

3
5
the index is out of range

func (*ArrayList[T]) Clear 

func (l *ArrayList[T]) Clear() *ArrayList[T]

Clear removes all elements from the list.

Example 
list := ArrayList[int]{1, 2, 3, 4, 5}
fmt.Println(list)
list.Clear()
fmt.Println(list)

Output:

[1 2 3 4 5]
[]

func (ArrayList[T]) Concat 

func (l ArrayList[T]) Concat(another ArrayList[T]) ArrayList[T]

Concat concatenates the current ArrayList with another ArrayList.

Example 
list1 := ArrayList[int]{1, 2, 3}
list2 := ArrayList[int]{4, 5, 6}
concatenated := list1.Concat(list2)
fmt.Println(concatenated)

Output:

[1 2 3 4 5 6]

func (ArrayList[T]) Copy 

func (l ArrayList[T]) Copy() ArrayList[T]

Copy creates a shallow copy of the ArrayList.

Example 
l := ArrayList[int]{1, 2, 3, 4, 5}
backup := l.Copy()
fmt.Println(backup)
fmt.Println(l.Equal(backup))

Output:

[1 2 3 4 5]
true

func (ArrayList[T]) Count 

func (l ArrayList[T]) Count(element T) (count int)

Count returns the number of occurrences of the specified element in the list

Example 
al := ArrayList[int]{1, 2, 3, 4, 5, 5, 5}
fmt.Println(al.Count(5))
fmt.Println(al.Count(6))

Output:

3
0

func (ArrayList[T]) Empty 

func (l ArrayList[T]) Empty() bool

Empty checks if the list is empty

Example 
al := ArrayList[int]{}
fmt.Println(al.Empty())
al2 := ArrayList[int]{1, 2, 3}
fmt.Println(al2.Empty())

Output:

true
false

func (ArrayList[T]) Equal 

func (l ArrayList[T]) Equal(another ArrayList[T]) bool

Equal checks if two lists are equal by comparing their elements

Example 
al1 := ArrayList[int]{1, 2, 3}
al2 := ArrayList[int]{1, 2, 3}
al3 := ArrayList[int]{1, 2, 3, 4}
al4 := ArrayList[int]{1, 2, 4}
fmt.Println(al1.Equal(al2))
fmt.Println(al1.Equal(al3))
fmt.Println(al1.Equal(al4))

Output:

true
false
false

func (ArrayList[T]) Every 

func (l ArrayList[T]) Every(condition func(T) bool) bool

Every checks if every item in the ArrayList satisfies the condition function.

Example 
list := ArrayList[int]{1, 2, 3, 4, 5}
allEven := list.Every(func(item int) bool {
	return item%2 == 0
})
fmt.Println(allEven)
allPositive := list.Every(func(item int) bool {
	return item > 0
})
fmt.Println(allPositive)

Output:

false
true

func (*ArrayList[T]) Fill 

func (l *ArrayList[T]) Fill(element T, area ...int) *ArrayList[T]

Fill fills the specified area with the specified element. If the area argument is not provided, the entire list will be filled with the specified element.

Example 
list := ArrayList[int]{1, 2, 3, 4, 5}
fmt.Println(list)
list.Fill(0, 1, 3)
fmt.Println(list)

Output:

[1 2 3 4 5]
[1 0 0 4 5]

func (ArrayList[T]) Filter 

func (l ArrayList[T]) Filter(condition func(T) bool) ArrayList[T]

Filter creates a new ArrayList with all items that pass the condition function.

Example 
list := ArrayList[int]{1, 2, 3, 4, 5}
condition := func(item int) bool {
	return item%2 == 0
}
filteredList := list.Filter(condition)
fmt.Println(filteredList)

Output:

[2 4]

func (ArrayList[T]) Find 

func (l ArrayList[T]) Find(by func(T) bool) (element T, found bool)

Find returns the first element that satisfies the given condition in the array list.

Example 
list := ArrayList[int]{1, 2, 3, 4, 5}
even := func(num int) bool {
	return num%2 == 0
}
fmt.Println(list.Find(even))
negative := func(num int) bool {
	return num < 0
}
fmt.Println(list.Find(negative))

Output:

2 true
0 false

func (ArrayList[T]) FindIndex 

func (l ArrayList[T]) FindIndex(by func(T) bool) (index int)

FindIndex returns the index of the first element that satisfies the given condition in the array list.

Example 
list := ArrayList[int]{1, 2, 3, 4, 5}
even := func(num int) bool {
	return num%2 == 0
}
fmt.Println(list.FindIndex(even))
negative := func(num int) bool {
	return num < 0
}
fmt.Println(list.FindIndex(negative))

Output:

1
-1

func (ArrayList[T]) FindIndexes 

func (l ArrayList[T]) FindIndexes(by func(T) bool, counts ...int) (indexes []int)

FindIndexes returns the indexes of elements that satisfy the given condition in the array list.

Example 
l := ArrayList[int]{1, 2, 3, 4, 5, 2}
condition := func(val int) bool {
	return val > 2
}
fmt.Println(l.FindIndexes(condition))
fmt.Println(l.FindIndexes(condition, 2))

Output:

[2 3 4]
[2 3]

func (ArrayList[T]) FindLast 

func (l ArrayList[T]) FindLast(by func(T) bool) (element T, found bool)

FindLast returns the last element that satisfies the given condition in the array list.

Example 
list := ArrayList[int]{1, 2, 3, 4, 5}
even := func(num int) bool {
	return num%2 == 0
}
fmt.Println(list.Find(even))
fmt.Println(list.FindLast(even))

Output:

2 true
4 true

func (ArrayList[T]) FindLastIndex 

func (l ArrayList[T]) FindLastIndex(by func(T) bool) (index int)

FindLastIndex returns the index of the last element that satisfies the given condition in the array list.

Example 
list := ArrayList[int]{1, 2, 3, 4, 5}
even := func(num int) bool {
	return num%2 == 0
}
fmt.Println(list.FindIndex(even))
fmt.Println(list.FindLastIndex(even))

Output:

1
3

func (ArrayList[T]) FindLastIndexes 

func (l ArrayList[T]) FindLastIndexes(by func(T) bool, counts ...int) (indexes []int)

FindLastIndexes returns the indexes of the last elements that satisfy the given condition in the array list.

Example 
l := ArrayList[int]{1, 2, 3, 4, 5, 2}
condition := func(val int) bool {
	return val > 2
}
fmt.Println(l.FindIndexes(condition))
fmt.Println(l.FindLastIndexes(condition))

Output:

[2 3 4]
[4 3 2]

func (ArrayList[T]) FindLasts 

func (l ArrayList[T]) FindLasts(by func(T) bool, counts ...int) (elements []T)

FindLasts returns the last elements that satisfy the given condition in the array list.

Example 
l := ArrayList[int]{1, 2, 3, 4, 5, 2}
condition := func(val int) bool {
	return val > 2
}
fmt.Println(l.Finds(condition))
fmt.Println(l.FindLasts(condition))

Output:

[3 4 5]
[5 4 3]

func (ArrayList[T]) Finds 

func (l ArrayList[T]) Finds(by func(T) bool, counts ...int) (elements []T)

Finds returns the elements that satisfy the given condition in the array list.

Example 
l := ArrayList[int]{1, 2, 3, 4, 5, 2}
condition := func(val int) bool {
	return val > 2
}
fmt.Println(l.Finds(condition))
fmt.Println(l.Finds(condition, 2))

Output:

[3 4 5]
[3 4]

func (*ArrayList[T]) ForEach 

func (l *ArrayList[T]) ForEach(action func(T) T) *ArrayList[T]

ForEach applies the specified action to each element of the list. Returns the modified list.

Example 
list := ArrayList[int]{1, 2, 3, 4, 5}
fmt.Println(list)
list.ForEach(func(item int) int {
	return item * 2
})
fmt.Println(list)

Output:

[1 2 3 4 5]
[2 4 6 8 10]

func (ArrayList[T]) Head 

func (l ArrayList[T]) Head() (element T, err error)

Head returns the first element of the array list.

Example 
list := ArrayList[int]{1, 2, 3, 4, 5}
fmt.Println(list.Head())
fmt.Println(ArrayList[int]{}.Head())

Output:

1 <nil>
0 the input list is empty

func (ArrayList[T]) Includes 

func (l ArrayList[T]) Includes(element T) bool

Includes checks if the specified element is present in the list

Example 
al := ArrayList[int]{1, 2, 3, 4, 5}
fmt.Println(al.Includes(3))
fmt.Println(al.Includes(6))

Output:

true
false

func (ArrayList[T]) IndexOf 

func (l ArrayList[T]) IndexOf(element T) (index int)

IndexOf returns the index of the first occurrence of the given element in the array list.

Example 
list := ArrayList[int]{1, 2, 3, 4, 5}
fmt.Println(list.IndexOf(3))
fmt.Println(list.IndexOf(6))

Output:

2
-1

func (*ArrayList[T]) Insert 

func (l *ArrayList[T]) Insert(index int, element T) *ArrayList[T]

Insert inserts the specified element at the specified index. If the index is negative, the index will be calculated from the end of the list. Returns the modified list.

Example 
list := ArrayList[int]{1, 2, 3}
fmt.Println(list)
list.Insert(1, 5)
fmt.Println(list)

Output:

[1 2 3]
[1 5 2 3]

func (ArrayList[T]) LastIndexOf 

func (l ArrayList[T]) LastIndexOf(element T) (index int)

LastIndexOf returns the index of the last occurrence of the given element in the array list.

Example 
list := ArrayList[int]{1, 2, 3, 4, 3}
fmt.Println(list.IndexOf(3))
fmt.Println(list.LastIndexOf(3))

Output:

2
4

func (ArrayList[T]) Len 

func (l ArrayList[T]) Len() int

Len returns the length of the list

Example 
al := ArrayList[int]{1, 2, 3, 4, 5}
length := al.Len()
fmt.Println(length) 

Output:

5

func (ArrayList[T]) Map 

func (l ArrayList[T]) Map(handler func(T) T) ArrayList[T]

Map applies the given handler function to each item in the ArrayList and returns a new ArrayList of the results.

Example 
list := ArrayList[int]{1, 2, 3, 4, 5}
handler := func(val int) int {
	return val * 2
}
newList := list.Map(handler)
fmt.Println(newList)
fmt.Println(list)

Output:

[2 4 6 8 10]
[1 2 3 4 5]

func (*ArrayList[T]) Pop 

func (l *ArrayList[T]) Pop(indexes ...int) (element T, err error)

Pop removes and returns the last element of the list. If the indexes argument is provided, the element at the specified index will be removed. Returns the removed element and an error if the index is out of range.

Example 
l := ArrayList[int]{1, 2, 3, 4, 5}
fmt.Println(l)
// Remove the last element
element, _ := l.Pop()
fmt.Println(element)
fmt.Println(l)
// Remove the element at a specific index
element, _ = l.Pop(2)
fmt.Println(element)
fmt.Println(l)

Output:

[1 2 3 4 5]
5
[1 2 3 4]
3
[1 2 4]

func (*ArrayList[T]) Push 

func (l *ArrayList[T]) Push(elements ...T) (length int)

Push adds one or more elements to the end of the list.

Example 
list := ArrayList[int]{1, 2, 3}
fmt.Println(list)
list.Push(4, 5, 6)
fmt.Println(list)

Output:

[1 2 3]
[1 2 3 4 5 6]

func (ArrayList[T]) Reduce 

func (l ArrayList[T]) Reduce(handler func(T, T) T, initial ...T) (result T, err error)

Reduce reduces the ArrayList to a single value by applying the handler function cumulatively to each item, starting with the initial value if provided.

Example 
list := ArrayList[int]{1, 2, 3, 4, 5}
// Example 1: Summing up the elements of the list
sum, _ := list.Reduce(func(a, b int) int {
	return a + b
})
fmt.Println(sum)
// Example 2: Finding the maximum element in the list
max, _ := list.Reduce(func(a, b int) int {
	if a > b {
		return a
	}
	return b
}, 0)
fmt.Println(max)
// Example 3: Summing up the elements of the list with initial value
sum, _ = list.Reduce(func(a, b int) int {
	return a + b
}, 10)
fmt.Println(sum)

Output:

15
5
25

func (ArrayList[T]) ReduceRight 

func (l ArrayList[T]) ReduceRight(handler func(T, T) T, initial ...T) (result T, err error)

ReduceRight reduces the ArrayList to a single value by applying the handler function cumulatively from right to left, starting with the initial value if provided.

Example 
list := ArrayList[int]{1, 2, 3, 4, 5}
f := func(a, b int) int {
	return a - b
}
result1, _ := list.Reduce(f)
fmt.Println(result1)
result2, _ := list.ReduceRight(f)
fmt.Println(result2)

Output:

-13
-5

func (*ArrayList[T]) Remove 

func (l *ArrayList[T]) Remove(element T, counts ...int) *ArrayList[T]

Remove removes the occurrences of the specified element from the list. If the count argument is provided, only the first count occurrences will be removed. Returns the modified list.

Example 
l := ArrayList[int]{1, 2, 2, 3, 4, 4, 4, 5, 5, 5, 5, 5}
fmt.Println(l)
l.Remove(2)
fmt.Println(l)
l.Remove(4, -1)
fmt.Println(l)
l.Remove(5, 2)
fmt.Println(l)

Output:

[1 2 2 3 4 4 4 5 5 5 5 5]
[1 2 3 4 4 4 5 5 5 5 5]
[1 2 3 5 5 5 5 5]
[1 2 3 5 5 5]

func (*ArrayList[T]) RemoveIf 

func (l *ArrayList[T]) RemoveIf(condition func(T) bool, counts ...int) ArrayList[T]

RemoveIf removes the elements that satisfy the specified condition. If the count argument is not provided, only the first count occurrences will be removed. Returns the removed elements.

Example 
list := ArrayList[int]{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
evenCondition := func(val int) bool {
	return val%2 == 0
}
fmt.Println(list)
removed := list.RemoveIf(evenCondition, -1)
fmt.Println(list)
fmt.Println(removed)

Output:

[1 2 3 4 5 6 7 8 9 10]
[1 3 5 7 9]
[2 4 6 8 10]

func (*ArrayList[T]) RemoveRight 

func (l *ArrayList[T]) RemoveRight(element T, counts ...int) *ArrayList[T]

RemoveRight removes the occurrences of the specified element from the right end of the list. If the count argument is provided, only the first count occurrences will be removed. Returns the modified list.

Example 
l := ArrayList[int]{1, 2, 3, 4, 5, 4, 3, 2, 1}
l2 := l.Copy()
fmt.Println(l)
l.Remove(4)
l2.RemoveRight(4)
fmt.Println(l)
fmt.Println(l2)

Output:

[1 2 3 4 5 4 3 2 1]
[1 2 3 5 4 3 2 1]
[1 2 3 4 5 3 2 1]

func (*ArrayList[T]) RemoveRightIf 

func (l *ArrayList[T]) RemoveRightIf(condition func(T) bool, counts ...int) ArrayList[T]

RemoveRightIf removes the elements that satisfy the specified condition from the right end of the list. If the count argument is not provided, only the first count occurrences will be removed. Returns the removed elements.

Example 
list := ArrayList[int]{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
list2 := list.Copy()
condition := func(val int) bool {
	return val%2 == 0
}
fmt.Println(list)
removed1 := list.RemoveRightIf(condition, 3)
removed2 := list2.RemoveIf(condition, 3)
fmt.Println(list)
fmt.Println(removed1)
fmt.Println(list2)
fmt.Println(removed2)

Output:

[1 2 3 4 5 6 7 8 9 10]
[1 2 3 4 5 7 9]
[10 8 6]
[1 3 5 7 8 9 10]
[2 4 6]

func (*ArrayList[T]) Replace 

func (l *ArrayList[T]) Replace(oldElement, newElement T, counts ...int) *ArrayList[T]

Replace replaces occurrences of the specified old element with the specified new element. If the count argument is not provided, only the first count occurrences will be replaced. Returns the modified list.

Example 
l := ArrayList[int]{1, 2, 2, 3, 4, 4, 4, 5, 5, 5, 5, 5}
fmt.Println(l)
l.Replace(2, -2)
fmt.Println(l)
l.Replace(4, -4, -1)
fmt.Println(l)
l.Replace(5, -5, 2)
fmt.Println(l)

Output:

[1 2 2 3 4 4 4 5 5 5 5 5]
[1 -2 2 3 4 4 4 5 5 5 5 5]
[1 -2 2 3 -4 -4 -4 5 5 5 5 5]
[1 -2 2 3 -4 -4 -4 -5 -5 5 5 5]

func (*ArrayList[T]) ReplaceIf 

func (l *ArrayList[T]) ReplaceIf(condition func(T) bool, newElement T, counts ...int) ArrayList[T]

ReplaceIf replaces the elements that satisfy the specified condition with the specified new element. If the count argument is not provided, only the first count occurrences will be replaced. Returns the replaced elements.

Example 
list := ArrayList[int]{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
evenCondition := func(val int) bool {
	return val%2 == 0
}
fmt.Println(list)
replaced := list.ReplaceIf(evenCondition, -1, -1)
fmt.Println(list)
fmt.Println(replaced)

Output:

[1 2 3 4 5 6 7 8 9 10]
[1 -1 3 -1 5 -1 7 -1 9 -1]
[2 4 6 8 10]

func (*ArrayList[T]) ReplaceRight 

func (l *ArrayList[T]) ReplaceRight(oldElement, newElement T, counts ...int) *ArrayList[T]

ReplaceRight replaces occurrences of the specified old element with the specified new element from the right end of the list. If the count argument is not provided, only the first count occurrences will be replaced. Returns the modified list.

Example 
l := ArrayList[int]{1, 2, 3, 4, 5, 4, 3, 2, 1}
l2 := l.Copy()
fmt.Println(l)
l.Replace(4, 0)
l2.ReplaceRight(4, 0)
fmt.Println(l)
fmt.Println(l2)

Output:

[1 2 3 4 5 4 3 2 1]
[1 2 3 0 5 4 3 2 1]
[1 2 3 4 5 0 3 2 1]

func (*ArrayList[T]) ReplaceRightIf 

func (l *ArrayList[T]) ReplaceRightIf(condition func(T) bool, newElement T, counts ...int) ArrayList[T]

ReplaceRightIf replaces the elements that satisfy the specified condition with the specified new element from the right end of the list. If the count argument is not provided, only the first count occurrences will be replaced. Returns the replaced elements.

Example 
list := ArrayList[int]{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
list2 := list.Copy()
condition := func(val int) bool {
	return val%2 == 0
}
fmt.Println(list)
replaced1 := list.ReplaceRightIf(condition, 0, 3)
replaced2 := list2.ReplaceIf(condition, 0, 3)
fmt.Println(list)
fmt.Println(replaced1)
fmt.Println(list2)
fmt.Println(replaced2)

Output:

[1 2 3 4 5 6 7 8 9 10]
[1 2 3 4 5 0 7 0 9 0]
[10 8 6]
[1 0 3 0 5 0 7 8 9 10]
[2 4 6]

func (*ArrayList[T]) Reverse 

func (l *ArrayList[T]) Reverse() *ArrayList[T]

Reverse reverses the order of the elements in the list.

Example 
l := ArrayList[int]{1, 2, 3, 4, 5}
fmt.Println(l)
l.Reverse()
fmt.Println(l)

Output:

[1 2 3 4 5]
[5 4 3 2 1]

func (*ArrayList[T]) Set 

func (l *ArrayList[T]) Set(index int, element T) (err error)

Set sets the element at the specified index to the specified element. If the index is negative, the index will be calculated from the end of the list. Returns an error if the index is out of range.

Example 
list := ArrayList[int]{1, 2, 3}
fmt.Println(list)
_ = list.Set(2, 6)
fmt.Println(list)
_ = list.Set(-2, 5)
fmt.Println(list)
err := list.Set(5, 6)
fmt.Println(err)
fmt.Println(list)

Output:

[1 2 3]
[1 2 6]
[1 5 6]
the index is out of range
[1 5 6]

func (*ArrayList[T]) Shift 

func (l *ArrayList[T]) Shift() (element T, err error)

Shift removes and returns the first element of the list.

Example 
list := ArrayList[int]{1, 2, 3, 4, 5}
fmt.Println(list)
element, _ := list.Shift()
fmt.Println(element)
fmt.Println(list)

Output:

[1 2 3 4 5]
1
[2 3 4 5]

func (ArrayList[T]) Slice 

func (l ArrayList[T]) Slice(args ...int) ArrayList[T]

Slice returns a new ArrayList by slicing the current ArrayList based on the provided arguments.

Example 
list := ArrayList[int]{1, 2, 3, 4, 5}
slice1 := list.Slice(1, 4)
fmt.Println(slice1)
slice2 := list.Slice(0, 3, 2)
fmt.Println(slice2)
slice3 := list.Slice(3, 0, -1)
fmt.Println(slice3)

Output:

[2 3 4]
[1 3]
[4 3 2]

func (ArrayList[T]) Some 

func (l ArrayList[T]) Some(condition func(T) bool) bool

Some checks if at least one item in the ArrayList satisfies the condition function.

Example 
list := ArrayList[int]{1, 2, 3, 4, 5}
result := list.Some(func(i int) bool {
	return i > 3
})
fmt.Println(result)
result = list.Some(func(i int) bool {
	return i > 5
})
fmt.Println(result)

Output:

true
false

func (*ArrayList[T]) Splice 

func (l *ArrayList[T]) Splice(start, deleteCount int, elements ...T) ArrayList[T]

Splice replaces the specified elements with the specified new elements.

Example 
arr := ArrayList[int]{1, 2, 3, 4, 5}
fmt.Println(arr)
arr.Splice(2, 2, 6, 7, 8)
fmt.Println(arr)

Output:

[1 2 3 4 5]
[1 2 6 7 8 5]

func (ArrayList[T]) Tail 

func (l ArrayList[T]) Tail() (element T, err error)

Tail returns the last element of the array list.

Example 
list := ArrayList[int]{1, 2, 3, 4, 5}
fmt.Println(list.Tail())
fmt.Println(ArrayList[int]{}.Tail())

Output:

5 <nil>
0 the input list is empty

func (ArrayList[T]) ToReversed 

func (l ArrayList[T]) ToReversed() ArrayList[T]

ToReversed returns a new ArrayList with its elements reversed compared to the current ArrayList.

Example 
l := ArrayList[int]{1, 2, 3, 4, 5}
reversed := l.ToReversed()
fmt.Println(reversed)
fmt.Println(l)

Output:

[5 4 3 2 1]
[1 2 3 4 5]

func (ArrayList[T]) ToSpliced 

func (l ArrayList[T]) ToSpliced(start, deleteCount int, items ...T) ArrayList[T]

ToSpliced returns a new ArrayList after applying the splice operation to the current ArrayList.

Example 
arr := ArrayList[int]{1, 2, 3, 4, 5}
newArr := arr.ToSpliced(2, 2, 6, 7, 8)
fmt.Println(newArr)
fmt.Println(arr)

Output:

[1 2 6 7 8 5]
[1 2 3 4 5]

func (*ArrayList[T]) Unshift 

func (l *ArrayList[T]) Unshift(elements ...T) (length int)

Unshift adds one or more elements to the beginning of the list.

Example 
l := ArrayList[int]{1, 2, 3}
fmt.Println(l)
l.Unshift(4, 5)
fmt.Println(l)

Output:

[1 2 3]
[4 5 1 2 3]

func (ArrayList[T]) With 

func (l ArrayList[T]) With(index int, element T) ArrayList[T]

With returns a new ArrayList after modifying an element at the specified index in the current ArrayList.

Example 
list := ArrayList[int]{1, 2, 3, 4, 5}
newList := list.With(2, 10)
fmt.Println(newList)
fmt.Println(list)

Output:

[1 2 10 4 5]
[1 2 3 4 5]

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