/
arrayHelper.ts
172 lines (143 loc) · 4.14 KB
/
arrayHelper.ts
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import { orderBy, orderByDesc } from './sortingHelper'
export {
add,
addOrUpdate,
addRange,
clear,
distinct,
contains,
insert,
insertRange,
max,
min,
orderBy,
orderByDesc,
removeAll,
removeAt,
removeFirst,
removeLast,
removeRange,
reverse,
setItem
}
function add<T>(observable: any, element: T): void {
let array = [...observable.state, element];
observable.setState(array);
}
function addOrUpdate<T>(observable: any, element: T, matcher: (e: T) => boolean, updater: (e: T) => T): void {
let array = Array.from<T>(observable.state);
let found = false;
for (let i = 0; i < array.length; i++) {
if (!matcher(array[i])) {
continue;
}
found = true;
array[i] = updater(array[i]);
}
if (!found) {
array.push(element);
}
observable.setState(array);
}
function addRange<T>(observable: any, elements: T[]): void {
let array = Array.from<T>(observable.state);
for (let i = 0; i < elements.length; i++) {
array.push(ko.unwrap(elements[i]));
}
observable.setState(array);
}
function clear(observable: any): void {
observable.setState([]);
}
function distinct<T>(array: T[]): T[] {
return Array.from(new Set(array.map(e => ko.unwrap(e))));
}
function contains<T>(array: T[], value: T): boolean {
return array.map(e => ko.unwrap(e)).includes(value);
}
function insert<T>(observable: any, index: number, element: T): void {
let array = Array.from<T>(observable.state);
array.splice(index, 0, element);
observable.setState(array);
}
function insertRange<T>(observable: any, index: number, elements: T[]): void {
let array = Array.from<T>(observable.state);
array.splice(index, 0, ...elements.map(element => ko.unwrap(element)));
observable.setState(array);
}
function max<T>(array: T[], selector: (item: T) => number): number | null {
if (array.length === 0) {
return null;
}
let max = selector(array[0]);
for (let i = 1; i < array.length; i++) {
let v = selector(array[i]);
if (v > max)
max = v;
}
return max;
}
function min<T>(array: T[], selector: (item: T) => number): number | null {
if (array.length === 0) {
return null;
}
let min = selector(array[0]);
for (let i = 1; i < array.length; i++) {
let v = selector(array[i]);
if (v < min)
min = v;
}
return min;
}
function removeAt<T>(observable: any, index: number): void {
let array = Array.from<T>(observable.state);
array.splice(index, 1);
observable.setState(array);
}
function removeAll<T>(observable: any, predicate: (s: T) => boolean): void {
let array = Array.from<T>(observable.state);
for (let i = 0; i < array.length; i++) {
if (predicate(array[i])) {
array.splice(i, 1);
i--;
}
}
observable.setState(array);
}
function removeRange<T>(observable: any, index: number, length: number): void {
let array = Array.from<T>(observable.state);
array.splice(index, length);
observable.setState(array);
}
function removeFirst<T>(observable: any, predicate: (s: T) => boolean): void {
let array = Array.from<T>(observable.state);
for (let i = 0; i < array.length; i++) {
if (predicate(array[i])) {
array.splice(i, 1);
break;
}
}
observable.setState(array);
}
function removeLast<T>(observable: any, predicate: (s: T) => boolean): void {
let array = Array.from<T>(observable.state);
for (let i = array.length - 1; i >= 0; i--) {
if (predicate(array[i])) {
array.splice(i, 1);
break;
}
}
observable.setState(array);
}
function reverse<T>(observable: any): void {
let array = Array.from<T>(observable.state);
array.reverse();
observable.setState(array);
}
function setItem<T>(observable: any, index: number, value: T): void {
let array = Array.from<T>(observable.state);
if (index < 0 || index >= array.length)
throw Error("Index out of range!");
array[index] = value;
observable.setState(array);
}