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float64s.go
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float64s.go
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package ameda
// OneFloat64 try to return the first element, otherwise return zero value.
func OneFloat64(f []float64) float64 {
if len(f) > 0 {
return f[0]
}
return 0
}
// Float64sCopy creates a copy of the float64 slice.
func Float64sCopy(f []float64) []float64 {
b := make([]float64, len(f))
copy(b, f)
return b
}
// Float64sToInterfaces converts float64 slice to interface slice.
func Float64sToInterfaces(f []float64) []interface{} {
r := make([]interface{}, len(f))
for k, v := range f {
r[k] = Float64ToInterface(v)
}
return r
}
// Float64sToStrings converts float64 slice to string slice.
func Float64sToStrings(f []float64) []string {
r := make([]string, len(f))
for k, v := range f {
r[k] = Float64ToString(v)
}
return r
}
// Float64sToBools converts float64 slice to bool slice.
// NOTE:
// 0 is false, everything else is true
func Float64sToBools(f []float64) []bool {
r := make([]bool, len(f))
for k, v := range f {
r[k] = Float64ToBool(v)
}
return r
}
// Float64sToFloat32s converts float64 slice to float32 slice.
func Float64sToFloat32s(f []float64) ([]float32, error) {
var err error
r := make([]float32, len(f))
for k, v := range f {
r[k], err = Float64ToFloat32(v)
if err != nil {
return r, err
}
}
return r, nil
}
// Float64sToInts converts float64 slice to int slice.
func Float64sToInts(f []float64) ([]int, error) {
var err error
r := make([]int, len(f))
for k, v := range f {
r[k], err = Float64ToInt(v)
if err != nil {
return r, err
}
}
return r, nil
}
// Float64sToInt8s converts float64 slice to int8 slice.
func Float64sToInt8s(f []float64) ([]int8, error) {
var err error
r := make([]int8, len(f))
for k, v := range f {
r[k], err = Float64ToInt8(v)
if err != nil {
return r, err
}
}
return r, nil
}
// Float64sToInt16s converts float64 slice to int16 slice.
func Float64sToInt16s(f []float64) ([]int16, error) {
var err error
r := make([]int16, len(f))
for k, v := range f {
r[k], err = Float64ToInt16(v)
if err != nil {
return r, err
}
}
return r, nil
}
// Float64sToInt32s converts float64 slice to int32 slice.
func Float64sToInt32s(f []float64) ([]int32, error) {
var err error
r := make([]int32, len(f))
for k, v := range f {
r[k], err = Float64ToInt32(v)
if err != nil {
return r, err
}
}
return r, nil
}
// Float64sToInt64s converts float64 slice to int64 slice.
func Float64sToInt64s(f []float64) ([]int64, error) {
var err error
r := make([]int64, len(f))
for k, v := range f {
r[k], err = Float64ToInt64(v)
if err != nil {
return r, err
}
}
return r, nil
}
// Float64sToUints converts float64 slice to uint slice.
func Float64sToUints(f []float64) ([]uint, error) {
var err error
r := make([]uint, len(f))
for k, v := range f {
r[k], err = Float64ToUint(v)
if err != nil {
return r, err
}
}
return r, nil
}
// Float64sToUint8s converts float64 slice to uint8 slice.
func Float64sToUint8s(f []float64) ([]uint8, error) {
var err error
r := make([]uint8, len(f))
for k, v := range f {
r[k], err = Float64ToUint8(v)
if err != nil {
return r, err
}
}
return r, nil
}
// Float64sToUint16s converts float64 slice to uint16 slice.
func Float64sToUint16s(f []float64) ([]uint16, error) {
var err error
r := make([]uint16, len(f))
for k, v := range f {
r[k], err = Float64ToUint16(v)
if err != nil {
return r, err
}
}
return r, nil
}
// Float64sToUint32s converts float64 slice to uint32 slice.
func Float64sToUint32s(f []float64) ([]uint32, error) {
var err error
r := make([]uint32, len(f))
for k, v := range f {
r[k], err = Float64ToUint32(v)
if err != nil {
return r, err
}
}
return r, nil
}
// Float64sToUint64s converts float64 slice to uint64 slice.
func Float64sToUint64s(f []float64) ([]uint64, error) {
var err error
r := make([]uint64, len(f))
for k, v := range f {
r[k], err = Float64ToUint64(v)
if err != nil {
return r, err
}
}
return r, nil
}
// Float64sCopyWithin 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 Float64sCopyWithin(f []float64, target, start int, end ...int) {
target = fixIndex(len(f), target, true)
if target == len(f) {
return
}
sub := Float64sSlice(f, start, end...)
for k, v := range sub {
f[target+k] = v
}
}
// Float64sEvery 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 Float64sEvery(f []float64, fn func(f []float64, k int, v float64) bool) bool {
for k, v := range f {
if !fn(f, k, v) {
return false
}
}
return true
}
// Float64sFill 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 Float64sFill(f []float64, value float64, start int, end ...int) {
fixedStart, fixedEnd, ok := fixRange(len(f), start, end...)
if !ok {
return
}
for k := fixedStart; k < fixedEnd; k++ {
f[k] = value
}
}
// Float64sFilter creates a new slice with all elements that pass the test implemented by the provided function.
func Float64sFilter(f []float64, fn func(f []float64, k int, v float64) bool) []float64 {
ret := make([]float64, 0)
for k, v := range f {
if fn(f, k, v) {
ret = append(ret, v)
}
}
return ret
}
// Float64sFind 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 Float64sFind(f []float64, fn func(f []float64, k int, v float64) bool) (k int, v float64) {
for k, v := range f {
if fn(f, k, v) {
return k, v
}
}
return -1, 0
}
// Float64sIncludes determines whether an slice includes a certain value among its entries.
// @fromIndex
// The index to start the search at. Defaults to 0.
func Float64sIncludes(f []float64, valueToFind float64, fromIndex ...int) bool {
return Float64sIndexOf(f, valueToFind, fromIndex...) > -1
}
// Float64sIndexOf 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 Float64sIndexOf(f []float64, searchElement float64, fromIndex ...int) int {
idx := getFromIndex(len(f), fromIndex...)
for k, v := range f[idx:] {
if searchElement == v {
return k + idx
}
}
return -1
}
// Float64sLastIndexOf 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 Float64sLastIndexOf(f []float64, searchElement float64, fromIndex ...int) int {
idx := getFromIndex(len(f), fromIndex...)
for k := len(f) - 1; k >= idx; k-- {
if searchElement == f[k] {
return k
}
}
return -1
}
// Float64sMap creates a new slice populated with the results of calling a provided function
// on every element in the calling slice.
func Float64sMap(f []float64, fn func(f []float64, k int, v float64) float64) []float64 {
ret := make([]float64, len(f))
for k, v := range f {
ret[k] = fn(f, k, v)
}
return ret
}
// Float64sPop removes the last element from an slice and returns that element.
// This method changes the length of the slice.
func Float64sPop(f *[]float64) (float64, bool) {
a := *f
if len(a) == 0 {
return 0, false
}
lastIndex := len(a) - 1
last := a[lastIndex]
a = a[:lastIndex]
*f = a[:len(a):len(a)]
return last, true
}
// Float64sPush adds one or more elements to the end of an slice and returns the new length of the slice.
func Float64sPush(f *[]float64, element ...float64) int {
*f = append(*f, element...)
return len(*f)
}
// Float64sPushDistinct adds one or more new elements that do not exist in the current slice at the end.
func Float64sPushDistinct(f []float64, element ...float64) []float64 {
L:
for _, v := range element {
for _, vv := range f {
if vv == v {
continue L
}
}
f = append(f, v)
}
return f
}
// Float64sReduce 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 Float64sReduce(
f []float64,
fn func(f []float64, k int, v, accumulator float64) float64, initialValue ...float64,
) float64 {
if len(f) == 0 {
return 0
}
start := 0
acc := f[start]
if len(initialValue) > 0 {
acc = initialValue[0]
} else {
start += 1
}
for k := start; k < len(f); k++ {
acc = fn(f, k, f[k], acc)
}
return acc
}
// Float64sReduceRight 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 Float64sReduceRight(
f []float64,
fn func(f []float64, k int, v, accumulator float64) float64, initialValue ...float64,
) float64 {
if len(f) == 0 {
return 0
}
end := len(f) - 1
acc := f[end]
if len(initialValue) > 0 {
acc = initialValue[0]
} else {
end -= 1
}
for k := end; k >= 0; k-- {
acc = fn(f, k, f[k], acc)
}
return acc
}
// Float64sReverse reverses an slice in place.
func Float64sReverse(f []float64) {
first := 0
last := len(f) - 1
for first < last {
f[first], f[last] = f[last], f[first]
first++
last--
}
}
// Float64sShift removes the first element from an slice and returns that removed element.
// This method changes the length of the slice.
func Float64sShift(f *[]float64) (float64, bool) {
a := *f
if len(a) == 0 {
return 0, false
}
first := a[0]
a = a[1:]
*f = a[:len(a):len(a)]
return first, true
}
// Float64sSlice 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 Float64sSlice(f []float64, begin int, end ...int) []float64 {
fixedStart, fixedEnd, ok := fixRange(len(f), begin, end...)
if !ok {
return []float64{}
}
return Float64sCopy(f[fixedStart:fixedEnd])
}
// Float64sSome 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 Float64sSome(f []float64, fn func(f []float64, k int, v float64) bool) bool {
for k, v := range f {
if fn(f, k, v) {
return true
}
}
return false
}
// Float64sSplice changes the contents of an slice by removing or replacing
// existing elements and/or adding new elements in place.
func Float64sSplice(f *[]float64, start, deleteCount int, items ...float64) {
a := *f
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 := Float64sCopy(a[start:])
items = items[k:]
a = append(a[:start], items...)
a = append(a[:start+len(items)], lastSlice...)
*f = a[:len(a):len(a)]
return
}
}
if deleteCount > 0 {
a = append(a[:start], a[start+1+deleteCount:]...)
}
*f = a[:len(a):len(a)]
}
// Float64sUnshift adds one or more elements to the beginning of an slice and returns the new length of the slice.
func Float64sUnshift(f *[]float64, element ...float64) int {
*f = append(element, *f...)
return len(*f)
}
// Float64sUnshiftDistinct 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 Float64sUnshiftDistinct(f *[]float64, element ...float64) int {
a := *f
if len(element) == 0 {
return len(a)
}
m := make(map[float64]bool, len(element))
r := make([]float64, 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...)
*f = r[:len(r):len(r)]
return len(r)
}
// Float64sRemoveFirst removes the first matched elements from the slice,
// and returns the new length of the slice.
func Float64sRemoveFirst(p *[]float64, elements ...float64) 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
}
// Float64sRemoveEvery removes all the elements from the slice,
// and returns the new length of the slice.
func Float64sRemoveEvery(p *[]float64, elements ...float64) 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
}
// Float64sIntersect calculates intersection of two or more slices,
// and returns the count of each element.
func Float64sIntersect(f ...[]float64) (intersectCount map[float64]int) {
if len(f) == 0 {
return nil
}
for _, v := range f {
if len(v) == 0 {
return nil
}
}
counts := make([]map[float64]int, len(f))
for k, v := range f {
counts[k] = float64sDistinct(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
}
// Float64sDistinct calculates the count of each different element,
// and only saves these different elements in place if changeSlice is true.
func Float64sDistinct(f *[]float64, changeSlice bool) (distinctCount map[float64]int) {
if !changeSlice {
return float64sDistinct(*f, nil)
}
a := (*f)[:0]
distinctCount = float64sDistinct(*f, &a)
n := len(distinctCount)
*f = a[:n:n]
return distinctCount
}
func float64sDistinct(src []float64, dst *[]float64) map[float64]int {
m := make(map[float64]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
}
// Float64SetUnion calculates between multiple collections: set1 ∪ set2 ∪ others...
// This method does not change the existing slices, but instead returns a new slice.
func Float64SetUnion(set1, set2 []float64, others ...[]float64) []float64 {
m := make(map[float64]struct{}, len(set1)+len(set2))
r := make([]float64, 0, len(m))
for _, set := range append([][]float64{set1, set2}, others...) {
for _, v := range set {
_, ok := m[v]
if ok {
continue
}
r = append(r, v)
m[v] = struct{}{}
}
}
return r
}
// Float64SetIntersect calculates between multiple collections: set1 ∩ set2 ∩ others...
// This method does not change the existing slices, but instead returns a new slice.
func Float64SetIntersect(set1, set2 []float64, others ...[]float64) []float64 {
sets := append([][]float64{set2}, others...)
setsCount := make([]map[float64]int, len(sets))
for k, v := range sets {
setsCount[k] = float64sDistinct(v, nil)
}
m := make(map[float64]struct{}, len(set1))
r := make([]float64, 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
}
// Float64SetDifference calculates between multiple collections: set1 - set2 - others...
// This method does not change the existing slices, but instead returns a new slice.
func Float64SetDifference(set1, set2 []float64, others ...[]float64) []float64 {
m := make(map[float64]struct{}, len(set1))
r := make([]float64, 0, len(set1))
sets := append([][]float64{set2}, others...)
for _, v := range sets {
inter := Float64SetIntersect(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
}