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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
export function shallowEqual(value, other) {
return (
value === other ||
(Array.isArray(value) &&
Array.isArray(other) &&
arrayShallowEqual(value, other)) ||
(isObject(value) && isObject(other) && objectShallowEqual(value, other))
);
}
export function arrayShallowEqual(value, other) {
return value.length === other.length && value.every((k, i) => k === other[i]);
}
function objectShallowEqual(value, other) {
const existingKeys = Object.keys(other);
const keys = Object.keys(value);
return (
keys.length === existingKeys.length &&
keys.every((k, i) => k === existingKeys[i]) &&
keys.every(k => value[k] === other[k])
);
}
function isObject(value) {
return typeof value === "object" && !!value;
}
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