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int32s.go
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int32s.go
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package ameda
// OneInt32 try to return the first element, otherwise return zero value.
func OneInt32(i []int32) int32 {
if len(i) > 0 {
return i[0]
}
return 0
}
// Int32sCopy creates a copy of the int32 slice.
func Int32sCopy(i []int32) []int32 {
b := make([]int32, len(i))
copy(b, i)
return b
}
// Int32sToInterfaces converts int32 slice to interface slice.
func Int32sToInterfaces(i []int32) []interface{} {
r := make([]interface{}, len(i))
for k, v := range i {
r[k] = Int32ToInterface(v)
}
return r
}
// Int32sToStrings converts int32 slice to string slice.
func Int32sToStrings(i []int32) []string {
r := make([]string, len(i))
for k, v := range i {
r[k] = Int32ToString(v)
}
return r
}
// Int32sToBools converts int32 slice to bool slice.
// NOTE:
// 0 is false, everything else is true
func Int32sToBools(i []int32) []bool {
r := make([]bool, len(i))
for k, v := range i {
r[k] = Int32ToBool(v)
}
return r
}
// Int32sToFloat32s converts int32 slice to float32 slice.
func Int32sToFloat32s(i []int32) []float32 {
r := make([]float32, len(i))
for k, v := range i {
r[k] = Int32ToFloat32(v)
}
return r
}
// Int32sToFloat64s converts int32 slice to float64 slice.
func Int32sToFloat64s(i []int32) []float64 {
r := make([]float64, len(i))
for k, v := range i {
r[k] = Int32ToFloat64(v)
}
return r
}
// Int32sToInts converts int32 slice to int slice.
func Int32sToInts(i []int32) []int {
r := make([]int, len(i))
for k, v := range i {
r[k] = Int32ToInt(v)
}
return r
}
// Int32sToInt8s converts int32 slice to int8 slice.
func Int32sToInt8s(i []int32) ([]int8, error) {
var err error
r := make([]int8, len(i))
for k, v := range i {
r[k], err = Int32ToInt8(v)
if err != nil {
return r, err
}
}
return r, nil
}
// Int32sToInt16s converts int32 slice to int16 slice.
func Int32sToInt16s(i []int32) ([]int16, error) {
var err error
r := make([]int16, len(i))
for k, v := range i {
r[k], err = Int32ToInt16(v)
if err != nil {
return r, err
}
}
return r, nil
}
// Int32sToInt64s converts int32 slice to int64 slice.
func Int32sToInt64s(i []int32) []int64 {
r := make([]int64, len(i))
for k, v := range i {
r[k] = Int32ToInt64(v)
}
return r
}
// Int32sToUints converts int32 slice to uint slice.
func Int32sToUints(i []int32) ([]uint, error) {
var err error
r := make([]uint, len(i))
for k, v := range i {
r[k], err = Int32ToUint(v)
if err != nil {
return r, err
}
}
return r, nil
}
// Int32sToUint8s converts int32 slice to uint8 slice.
func Int32sToUint8s(i []int32) ([]uint8, error) {
var err error
r := make([]uint8, len(i))
for k, v := range i {
r[k], err = Int32ToUint8(v)
if err != nil {
return r, err
}
}
return r, nil
}
// Int32sToUint16s converts int32 slice to uint16 slice.
func Int32sToUint16s(i []int32) ([]uint16, error) {
var err error
r := make([]uint16, len(i))
for k, v := range i {
r[k], err = Int32ToUint16(v)
if err != nil {
return r, err
}
}
return r, nil
}
// Int32sToUint32s converts int32 slice to uint32 slice.
func Int32sToUint32s(i []int32) ([]uint32, error) {
var err error
r := make([]uint32, len(i))
for k, v := range i {
r[k], err = Int32ToUint32(v)
if err != nil {
return r, err
}
}
return r, nil
}
// Int32sToUint64s converts int32 slice to uint64 slice.
func Int32sToUint64s(i []int32) ([]uint64, error) {
var err error
r := make([]uint64, len(i))
for k, v := range i {
r[k], err = Int32ToUint64(v)
if err != nil {
return r, err
}
}
return r, nil
}
// Int32sCopyWithin copies part of an slice to another location in the current slice.
// @target
// Zero-based index at which to copy the sequence to. If negative, target will be counted from the end.
// @start
// Zero-based index at which to start copying elements from. If negative, start will be counted from the end.
// @end
// Zero-based index at which to end copying elements from. CopyWithin copies up to but not including end.
// If negative, end will be counted from the end.
// If end is omitted, CopyWithin will copy until the last index (default to len(s)).
func Int32sCopyWithin(i []int32, target, start int, end ...int) {
target = fixIndex(len(i), target, true)
if target == len(i) {
return
}
sub := Int32sSlice(i, start, end...)
for k, v := range sub {
i[target+k] = v
}
}
// Int32sEvery tests whether all elements in the slice pass the test implemented by the provided function.
// NOTE:
// Calling this method on an empty slice will return true for any condition!
func Int32sEvery(i []int32, fn func(i []int32, k int, v int32) bool) bool {
for k, v := range i {
if !fn(i, k, v) {
return false
}
}
return true
}
// Int32sFill changes all elements in the current slice to a value, from a start index to an end index.
// @value
// Zero-based index at which to copy the sequence to. If negative, target will be counted from the end.
// @start
// Zero-based index at which to start copying elements from. If negative, start will be counted from the end.
// @end
// Zero-based index at which to end copying elements from. CopyWithin copies up to but not including end.
// If negative, end will be counted from the end.
// If end is omitted, CopyWithin will copy until the last index (default to len(s)).
func Int32sFill(i []int32, value int32, start int, end ...int) {
fixedStart, fixedEnd, ok := fixRange(len(i), start, end...)
if !ok {
return
}
for k := fixedStart; k < fixedEnd; k++ {
i[k] = value
}
}
// Int32sFilter creates a new slice with all elements that pass the test implemented by the provided function.
func Int32sFilter(i []int32, fn func(i []int32, k int, v int32) bool) []int32 {
ret := make([]int32, 0)
for k, v := range i {
if fn(i, k, v) {
ret = append(ret, v)
}
}
return ret
}
// Int32sFind returns the key-value of the first element in the provided slice that satisfies the provided testing function.
// NOTE:
// If not found, k = -1
func Int32sFind(i []int32, fn func(i []int32, k int, v int32) bool) (k int, v int32) {
for k, v := range i {
if fn(i, k, v) {
return k, v
}
}
return -1, 0
}
// Int32sIncludes determines whether an slice includes a certain value among its entries.
// @fromIndex
// The index to start the search at. Defaults to 0.
func Int32sIncludes(i []int32, valueToFind int32, fromIndex ...int) bool {
return Int32sIndexOf(i, valueToFind, fromIndex...) > -1
}
// Int32sIndexOf returns the first index at which a given element can be found in the slice, or -1 if it is not present.
// @fromIndex
// The index to start the search at. Defaults to 0.
func Int32sIndexOf(i []int32, searchElement int32, fromIndex ...int) int {
idx := getFromIndex(len(i), fromIndex...)
for k, v := range i[idx:] {
if searchElement == v {
return k + idx
}
}
return -1
}
// Int32sLastIndexOf returns the last index at which a given element can be found in the slice, or -1 if it is not present.
// @fromIndex
// The index to start the search at. Defaults to 0.
func Int32sLastIndexOf(i []int32, searchElement int32, fromIndex ...int) int {
idx := getFromIndex(len(i), fromIndex...)
for k := len(i) - 1; k >= idx; k-- {
if searchElement == i[k] {
return k
}
}
return -1
}
// Int32sMap creates a new slice populated with the results of calling a provided function
// on every element in the calling slice.
func Int32sMap(i []int32, fn func(i []int32, k int, v int32) int32) []int32 {
ret := make([]int32, len(i))
for k, v := range i {
ret[k] = fn(i, k, v)
}
return ret
}
// Int32sPop removes the last element from an slice and returns that element.
// This method changes the length of the slice.
func Int32sPop(i *[]int32) (int32, bool) {
a := *i
if len(a) == 0 {
return 0, false
}
lastIndex := len(a) - 1
last := a[lastIndex]
a = a[:lastIndex]
*i = a[:len(a):len(a)]
return last, true
}
// Int32sPush adds one or more elements to the end of an slice and returns the new length of the slice.
func Int32sPush(i *[]int32, element ...int32) int {
*i = append(*i, element...)
return len(*i)
}
// Int32sPushDistinct adds one or more new elements that do not exist in the current slice at the end.
func Int32sPushDistinct(i []int32, element ...int32) []int32 {
L:
for _, v := range element {
for _, vv := range i {
if vv == v {
continue L
}
}
i = append(i, v)
}
return i
}
// Int32sReduce executes a reducer function (that you provide) on each element of the slice,
// resulting in a single output value.
// @accumulator
// The accumulator accumulates callback's return values.
// It is the accumulated value previously returned in the last invocation of the callback—or initialValue,
// if it was supplied (see below).
// @initialValue
// A value to use as the first argument to the first call of the callback.
// If no initialValue is supplied, the first element in the slice will be used and skipped.
func Int32sReduce(i []int32,
fn func(i []int32, k int, v, accumulator int32) int32, initialValue ...int32,
) int32 {
if len(i) == 0 {
return 0
}
start := 0
acc := i[start]
if len(initialValue) > 0 {
acc = initialValue[0]
} else {
start += 1
}
for k := start; k < len(i); k++ {
acc = fn(i, k, i[k], acc)
}
return acc
}
// Int32sReduceRight applies a function against an accumulator and each value of the slice (from right-to-left)
// to reduce it to a single value.
// @accumulator
// The accumulator accumulates callback's return values.
// It is the accumulated value previously returned in the last invocation of the callback—or initialValue,
// if it was supplied (see below).
// @initialValue
// A value to use as the first argument to the first call of the callback.
// If no initialValue is supplied, the first element in the slice will be used and skipped.
func Int32sReduceRight(i []int32,
fn func(i []int32, k int, v, accumulator int32) int32, initialValue ...int32,
) int32 {
if len(i) == 0 {
return 0
}
end := len(i) - 1
acc := i[end]
if len(initialValue) > 0 {
acc = initialValue[0]
} else {
end -= 1
}
for k := end; k >= 0; k-- {
acc = fn(i, k, i[k], acc)
}
return acc
}
// Int32sReverse reverses an slice in place.
func Int32sReverse(i []int32) {
first := 0
last := len(i) - 1
for first < last {
i[first], i[last] = i[last], i[first]
first++
last--
}
}
// Int32sShift removes the first element from an slice and returns that removed element.
// This method changes the length of the slice.
func Int32sShift(i *[]int32) (int32, bool) {
a := *i
if len(a) == 0 {
return 0, false
}
first := a[0]
a = a[1:]
*i = a[:len(a):len(a)]
return first, true
}
// Int32sSlice returns a copy of a portion of an slice into a new slice object selected
// from begin to end (end not included) where begin and end represent the index of items in that slice.
// The original slice will not be modified.
func Int32sSlice(i []int32, begin int, end ...int) []int32 {
fixedStart, fixedEnd, ok := fixRange(len(i), begin, end...)
if !ok {
return []int32{}
}
return Int32sCopy(i[fixedStart:fixedEnd])
}
// Int32sSome tests whether at least one element in the slice passes the test implemented by the provided function.
// NOTE:
// Calling this method on an empty slice returns false for any condition!
func Int32sSome(i []int32, fn func(i []int32, k int, v int32) bool) bool {
for k, v := range i {
if fn(i, k, v) {
return true
}
}
return false
}
// Int32sSplice changes the contents of an slice by removing or replacing
// existing elements and/or adding new elements in place.
func Int32sSplice(i *[]int32, start, deleteCount int, items ...int32) {
a := *i
if deleteCount < 0 {
deleteCount = 0
}
start, end, _ := fixRange(len(a), start, start+1+deleteCount)
deleteCount = end - start - 1
for k := 0; k < len(items); k++ {
if deleteCount > 0 {
// replace
a[start] = items[k]
deleteCount--
start++
} else {
// insert
lastSlice := Int32sCopy(a[start:])
items = items[k:]
a = append(a[:start], items...)
a = append(a[:start+len(items)], lastSlice...)
*i = a[:len(a):len(a)]
return
}
}
if deleteCount > 0 {
a = append(a[:start], a[start+1+deleteCount:]...)
}
*i = a[:len(a):len(a)]
}
// Int32sUnshift adds one or more elements to the beginning of an slice and returns the new length of the slice.
func Int32sUnshift(i *[]int32, element ...int32) int {
*i = append(element, *i...)
return len(*i)
}
// Int32sUnshiftDistinct adds one or more new elements that do not exist in the current slice to the beginning
// and returns the new length of the slice.
func Int32sUnshiftDistinct(i *[]int32, element ...int32) int {
a := *i
if len(element) == 0 {
return len(a)
}
m := make(map[int32]bool, len(element))
r := make([]int32, 0, len(a)+len(element))
L:
for _, v := range element {
if m[v] {
continue
}
m[v] = true
for _, vv := range a {
if vv == v {
continue L
}
}
r = append(r, v)
}
r = append(r, a...)
*i = r[:len(r):len(r)]
return len(r)
}
// Int32sRemoveFirst removes the first matched elements from the slice,
// and returns the new length of the slice.
func Int32sRemoveFirst(p *[]int32, elements ...int32) int {
a := *p
m := make(map[interface{}]struct{}, len(elements))
for _, element := range elements {
if _, ok := m[element]; ok {
continue
}
m[element] = struct{}{}
for k, v := range a {
if v == element {
a = append(a[:k], a[k+1:]...)
break
}
}
}
n := len(a)
*p = a[:n:n]
return n
}
// Int32sRemoveEvery removes all the elements from the slice,
// and returns the new length of the slice.
func Int32sRemoveEvery(p *[]int32, elements ...int32) int {
a := *p
m := make(map[interface{}]struct{}, len(elements))
for _, element := range elements {
if _, ok := m[element]; ok {
continue
}
m[element] = struct{}{}
for i := 0; i < len(a); i++ {
if a[i] == element {
a = append(a[:i], a[i+1:]...)
i--
}
}
}
n := len(a)
*p = a[:n:n]
return n
}
// Int32sConcat is used to merge two or more slices.
// This method does not change the existing slices, but instead returns a new slice.
func Int32sConcat(i ...[]int32) []int32 {
var totalLen int
for _, v := range i {
totalLen += len(v)
}
ret := make([]int32, totalLen)
dst := ret
for _, v := range i {
n := copy(dst, v)
dst = dst[n:]
}
return ret
}
// Int32sIntersect calculates intersection of two or more slices,
// and returns the count of each element.
func Int32sIntersect(i ...[]int32) (intersectCount map[int32]int) {
if len(i) == 0 {
return nil
}
for _, v := range i {
if len(v) == 0 {
return nil
}
}
counts := make([]map[int32]int, len(i))
for k, v := range i {
counts[k] = int32sDistinct(v, nil)
}
intersectCount = counts[0]
L:
for k, v := range intersectCount {
for _, c := range counts[1:] {
v2 := c[k]
if v2 == 0 {
delete(intersectCount, k)
continue L
}
if v > v2 {
v = v2
}
}
intersectCount[k] = v
}
return intersectCount
}
// Int32sDistinct calculates the count of each different element,
// and only saves these different elements in place if changeSlice is true.
func Int32sDistinct(i *[]int32, changeSlice bool) (distinctCount map[int32]int) {
if !changeSlice {
return int32sDistinct(*i, nil)
}
a := (*i)[:0]
distinctCount = int32sDistinct(*i, &a)
n := len(distinctCount)
*i = a[:n:n]
return distinctCount
}
func int32sDistinct(src []int32, dst *[]int32) map[int32]int {
m := make(map[int32]int, len(src))
if dst == nil {
for _, v := range src {
n := m[v]
m[v] = n + 1
}
} else {
a := *dst
for _, v := range src {
n := m[v]
m[v] = n + 1
if n == 0 {
a = append(a, v)
}
}
*dst = a
}
return m
}
// Int32SetUnion calculates between multiple collections: set1 ∪ set2 ∪ others...
// This method does not change the existing slices, but instead returns a new slice.
func Int32SetUnion(set1, set2 []int32, others ...[]int32) []int32 {
m := make(map[int32]struct{}, len(set1)+len(set2))
r := make([]int32, 0, len(m))
for _, set := range append([][]int32{set1, set2}, others...) {
for _, v := range set {
_, ok := m[v]
if ok {
continue
}
r = append(r, v)
m[v] = struct{}{}
}
}
return r
}
// Int32SetIntersect calculates between multiple collections: set1 ∩ set2 ∩ others...
// This method does not change the existing slices, but instead returns a new slice.
func Int32SetIntersect(set1, set2 []int32, others ...[]int32) []int32 {
sets := append([][]int32{set2}, others...)
setsCount := make([]map[int32]int, len(sets))
for k, v := range sets {
setsCount[k] = int32sDistinct(v, nil)
}
m := make(map[int32]struct{}, len(set1))
r := make([]int32, 0, len(m))
L:
for _, v := range set1 {
if _, ok := m[v]; ok {
continue
}
m[v] = struct{}{}
for _, m2 := range setsCount {
if m2[v] == 0 {
continue L
}
}
r = append(r, v)
}
return r
}
// Int32SetDifference calculates between multiple collections: set1 - set2 - others...
// This method does not change the existing slices, but instead returns a new slice.
func Int32SetDifference(set1, set2 []int32, others ...[]int32) []int32 {
m := make(map[int32]struct{}, len(set1))
r := make([]int32, 0, len(set1))
sets := append([][]int32{set2}, others...)
for _, v := range sets {
inter := Int32SetIntersect(set1, v)
for _, v := range inter {
m[v] = struct{}{}
}
}
for _, v := range set1 {
if _, ok := m[v]; !ok {
r = append(r, v)
m[v] = struct{}{}
}
}
return r
}