42 lines
1.2 KiB
JavaScript
42 lines
1.2 KiB
JavaScript
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/*
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Copyright 2020 Bruno Windels <bruno@windels.cloud>
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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export function mergeMap(src, dst) {
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if (src) {
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for (const [key, value] of src.entries()) {
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dst.set(key, value);
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}
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}
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}
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export function tests() {
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return {
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"mergeMap with src": assert => {
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const src = new Map();
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src.set(1, "a");
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const dst = new Map();
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dst.set(2, "b");
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mergeMap(src, dst);
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assert.equal(dst.get(1), "a");
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assert.equal(dst.get(2), "b");
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assert.equal(src.get(2), null);
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},
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"mergeMap without src doesn't fail": () => {
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mergeMap(undefined, new Map());
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}
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}
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}
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