slices

func BinarySearch ¶

func BinarySearch[S ~[]E, E constraints.Ordered](x S, target E) (int, bool)

BinarySearch searches for target in a sorted slice and returns the position where target is found, or the position where target would appear in the sort order; it also returns a bool saying whether the target is really found in the slice. The slice must be sorted in increasing order.

func BinarySearchFunc ¶

func BinarySearchFunc[S ~[]E, E, T any](x S, target T, cmp func(E, T) int) (int, bool)

BinarySearchFunc works like BinarySearch, but uses a custom comparison function. The slice must be sorted in increasing order, where "increasing" is defined by cmp. cmp should return 0 if the slice element matches the target, a negative number if the slice element precedes the target, or a positive number if the slice element follows the target. cmp must implement the same ordering as the slice, such that if cmp(a, t) < 0 and cmp(b, t) >= 0, then a must precede b in the slice.

func Clip ¶

func Clip[S ~[]E, E any](s S) S

Clip removes unused capacity from the slice, returning s[:len(s):len(s)].

func Clone ¶

func Clone[S ~[]E, E any](s S) S

Clone returns a copy of the slice. The elements are copied using assignment, so this is a shallow clone.

func Compact ¶

func Compact[S ~[]E, E comparable](s S) S

Compact replaces consecutive runs of equal elements with a single copy. This is like the uniq command found on Unix. Compact modifies the contents of the slice s and returns the modified slice, which may have a smaller length. Compact zeroes the elements between the new length and the original length.

func CompactFunc ¶

func CompactFunc[S ~[]E, E any](s S, eq func(E, E) bool) S

CompactFunc is like Compact but uses an equality function to compare elements. For runs of elements that compare equal, CompactFunc keeps the first one. CompactFunc zeroes the elements between the new length and the original length.

func Compare ¶

func Compare[S ~[]E, E constraints.Ordered](s1, s2 S) int

Compare compares the elements of s1 and s2, using cmp.Compare on each pair of elements. The elements are compared sequentially, starting at index 0, until one element is not equal to the other. The result of comparing the first non-matching elements is returned. If both slices are equal until one of them ends, the shorter slice is considered less than the longer one. The result is 0 if s1 == s2, -1 if s1 < s2, and +1 if s1 > s2.

func CompareFunc ¶

func CompareFunc[S1 ~[]E1, S2 ~[]E2, E1, E2 any](s1 S1, s2 S2, cmp func(E1, E2) int) int

CompareFunc is like Compare but uses a custom comparison function on each pair of elements. The result is the first non-zero result of cmp; if cmp always returns 0 the result is 0 if len(s1) == len(s2), -1 if len(s1) < len(s2), and +1 if len(s1) > len(s2).

func Contains ¶

func Contains[S ~[]E, E comparable](s S, v E) bool

Contains reports whether v is present in s.

func ContainsFunc ¶

func ContainsFunc[S ~[]E, E any](s S, f func(E) bool) bool

ContainsFunc reports whether at least one element e of s satisfies f(e).

func Delete ¶

func Delete[S ~[]E, E any](s S, i, j int) S

Delete removes the elements s[i:j] from s, returning the modified slice. Delete panics if j > len(s) or s[i:j] is not a valid slice of s. Delete is O(len(s)-i), so if many items must be deleted, it is better to make a single call deleting them all together than to delete one at a time. Delete zeroes the elements s[len(s)-(j-i):len(s)].

func DeleteFunc ¶

func DeleteFunc[S ~[]E, E any](s S, del func(E) bool) S

DeleteFunc removes any elements from s for which del returns true, returning the modified slice. DeleteFunc zeroes the elements between the new length and the original length.

func Equal ¶

func Equal[S ~[]E, E comparable](s1, s2 S) bool

Equal reports whether two slices are equal: the same length and all elements equal. If the lengths are different, Equal returns false. Otherwise, the elements are compared in increasing index order, and the comparison stops at the first unequal pair. Floating point NaNs are not considered equal.

func EqualFunc ¶

func EqualFunc[S1 ~[]E1, S2 ~[]E2, E1, E2 any](s1 S1, s2 S2, eq func(E1, E2) bool) bool

EqualFunc reports whether two slices are equal using an equality function on each pair of elements. If the lengths are different, EqualFunc returns false. Otherwise, the elements are compared in increasing index order, and the comparison stops at the first index for which eq returns false.

func Grow ¶

func Grow[S ~[]E, E any](s S, n int) S

Grow increases the slice's capacity, if necessary, to guarantee space for another n elements. After Grow(n), at least n elements can be appended to the slice without another allocation. If n is negative or too large to allocate the memory, Grow panics.

func Index ¶

func Index[S ~[]E, E comparable](s S, v E) int

Index returns the index of the first occurrence of v in s, or -1 if not present.

func IndexFunc ¶

func IndexFunc[S ~[]E, E any](s S, f func(E) bool) int

IndexFunc returns the first index i satisfying f(s[i]), or -1 if none do.

func Insert ¶

func Insert[S ~[]E, E any](s S, i int, v ...E) S

Insert inserts the values v... into s at index i, returning the modified slice. The elements at s[i:] are shifted up to make room. In the returned slice r, r[i] == v[0], and r[i+len(v)] == value originally at r[i]. Insert panics if i is out of range. This function is O(len(s) + len(v)).

func IsSorted ¶

func IsSorted[S ~[]E, E constraints.Ordered](x S) bool

IsSorted reports whether x is sorted in ascending order.

func IsSortedFunc ¶

func IsSortedFunc[S ~[]E, E any](x S, cmp func(a, b E) int) bool

IsSortedFunc reports whether x is sorted in ascending order, with cmp as the comparison function as defined by SortFunc.

func Max ¶

func Max[S ~[]E, E constraints.Ordered](x S) E

Max returns the maximal value in x. It panics if x is empty. For floating-point E, Max propagates NaNs (any NaN value in x forces the output to be NaN).

func MaxFunc ¶

func MaxFunc[S ~[]E, E any](x S, cmp func(a, b E) int) E

MaxFunc returns the maximal value in x, using cmp to compare elements. It panics if x is empty. If there is more than one maximal element according to the cmp function, MaxFunc returns the first one.

func Min ¶

func Min[S ~[]E, E constraints.Ordered](x S) E

Min returns the minimal value in x. It panics if x is empty. For floating-point numbers, Min propagates NaNs (any NaN value in x forces the output to be NaN).

func MinFunc ¶

func MinFunc[S ~[]E, E any](x S, cmp func(a, b E) int) E

MinFunc returns the minimal value in x, using cmp to compare elements. It panics if x is empty. If there is more than one minimal element according to the cmp function, MinFunc returns the first one.

func Replace ¶

func Replace[S ~[]E, E any](s S, i, j int, v ...E) S

Replace replaces the elements s[i:j] by the given v, and returns the modified slice. Replace panics if s[i:j] is not a valid slice of s. When len(v) < (j-i), Replace zeroes the elements between the new length and the original length.

func Reverse ¶

func Reverse[S ~[]E, E any](s S)

Reverse reverses the elements of the slice in place.

func Sort ¶

func Sort[S ~[]E, E constraints.Ordered](x S)

Sort sorts a slice of any ordered type in ascending order. When sorting floating-point numbers, NaNs are ordered before other values.

func SortFunc ¶

func SortFunc[S ~[]E, E any](x S, cmp func(a, b E) int)

SortFunc sorts the slice x in ascending order as determined by the cmp function. This sort is not guaranteed to be stable. cmp(a, b) should return a negative number when a < b, a positive number when a > b and zero when a == b.

SortFunc requires that cmp is a strict weak ordering. See https://en.wikipedia.org/wiki/Weak_ordering#Strict_weak_orderings.

func SortStableFunc ¶

func SortStableFunc[S ~[]E, E any](x S, cmp func(a, b E) int)

SortStableFunc sorts the slice x while keeping the original order of equal elements, using cmp to compare elements in the same way as SortFunc.