724ae41e1b
This function works like toMap does, except that it returns an output object with keys and values derived from input values.
106 lines
3.6 KiB
TypeScript
106 lines
3.6 KiB
TypeScript
// Copyright 2016-2018, Pulumi Corporation.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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import { Input, Output } from "../resource";
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/**
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* toObject takes an array of T values, and a selector that produces key/value pairs from those inputs,
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* and converts this array into an output object with those keys and values.
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*
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* For instance, given an array as follows
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*
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* [{ s: "a", n: 1 }, { s: "b", n: 2 }, { s: "c", n: 3 }]
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*
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* and whose selector is roughly `(e) => [e.s, e.n]`, the resulting object will be
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*
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* { "a": 1, "b": 2, "c": 3 }
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*
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*/
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export function toObject<T, V>(
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iter: Input<Input<T>[]>, selector: (t: T) => [Input<string>, Input<V>]): Output<{[key: string]: V}> {
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return Output.create(iter).apply(elems => {
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const array: [Input<string>, Input<V>][] = [];
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for (const e of elems) {
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array.push(selector(<any>e));
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}
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return Output.create(array).apply(a => {
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const obj: {[key: string]: V} = {};
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for (const e of a) {
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obj[<any>e[0]] = <any>e[1];
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}
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return obj;
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});
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});
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}
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/**
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* toMap takes an array of T values, and a selector that produces key/value pairs from those inputs,
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* and converts this array into an output map with those keys and values.
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*
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* For instance, given an array as follows
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*
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* [{ s: "a", n: 1 }, { s: "b", n: 2 }, { s: "c", n: 3 }]
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*
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* and whose selector is roughly `(e) => [e.s, e.n]`, the resulting map will contain
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*
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* [[ "a", 1 ], [ "b", 2 ], [ "c", 3 ]]
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*
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*/
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export function toMap<T, K, V>(
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iter: Input<Input<T>[]>, selector: (t: T) => [Input<K>, Input<V>]): Output<Map<K, V>> {
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return Output.create(iter).apply(elems => {
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const array: [Input<K>, Input<V>][] = [];
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for (const e of elems) {
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array.push(selector(<any>e));
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}
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return Output.create(array).apply(a => new Map<K, V>(<any>a));
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});
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}
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/**
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* groupBy takes an array of T values, and a selector that prduces key/value pairs from those inputs,
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* and converts this array into an output map, with those keys, and where each entry is an array of values,
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* in the case that the same key shows up multiple times in the input.
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*
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* For instance, given an array as follows
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*
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* [{ s: "a", n: 1 }, { s: "a", n: 2 }, { s: "b", n: 1 }]
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*
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* and whose selector is roughly `(e) => [e.s, e.n]`, the resulting map will contain
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*
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* [[ "a", [1, 2] ], [ "b", [1] ]]
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*
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*/
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export function groupBy<T, K, V>(
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iter: Input<Input<T>[]>, selector: (t: T) => [Input<K>, Input<V>]): Output<Map<K, V[]>> {
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return Output.create(iter).apply(elems => {
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const array: [Input<K>, Input<V>][] = [];
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for (const e of elems) {
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array.push(selector(<any>e));
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}
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return Output.create(array).apply(kvps => {
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const m = new Map<K, V[]>();
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for (let kvp of kvps) {
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let r = m.get(<any>kvp[0]);
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if (!r) {
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r = [];
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m.set(<any>kvp[0], r);
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}
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r.push(<any>kvp[1]);
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}
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return m;
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});
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});
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}
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