@finos/legend-shared
Version:
Legend Studio shared utilities and helpers
65 lines • 2.33 kB
JavaScript
/**
* Copyright (c) 2020-present, Goldman Sachs
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import seedrandom from 'seedrandom';
export class Randomizer {
rng = seedrandom();
/**
* This method is exposed to allow setting seeds in test.
* NOTE: Disable this during production for security.
*/
setSeed(seed) {
// eslint-disable-next-line no-process-env
if (process.env.NODE_ENV === 'production') {
return;
}
this.rng = seedrandom(seed);
}
/**
* Get a random float in internal [0,1]
*/
getRandomFloat() {
// NOTE: the randomizer library we use automatically guarantee the value lies within the interval [0,1]
// but we do this just in case
return Math.abs(this.rng.quick() % 1);
}
/**
* Get a random double in internal [0,1]
*/
getRandomDouble() {
// NOTE: the randomizer library we use automatically guarantee the value lies within the interval [0,1]
// but we do this just in case
return Math.abs(this.rng.double() % 1);
}
getRandomSignedInteger() {
return this.rng.int32();
}
/**
* Return whole number in internal [0, max] if `max` is specified, or otherwise, [0, Infinity)
*/
getRandomWholeNumber(max) {
return max !== undefined
? Math.abs(Math.floor(this.getRandomFloat() * Math.floor(max)))
: Math.abs(this.getRandomSignedInteger());
}
getRandomItemInCollection(collection) {
return collection[this.getRandomWholeNumber(collection.length - 1)];
}
getRandomDate(start, end) {
return new Date(start.getTime() +
Math.floor(this.getRandomFloat() * (end.getTime() - start.getTime())));
}
}
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