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add utility to observe reducers fields change

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This commit is contained in:
Szymon Lesisz 2018-09-22 15:40:32 +02:00
parent 51253665be
commit a9e811ab5b
1 changed files with 19 additions and 0 deletions
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19
src/reducers/utils/index.js
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@ -115,3 +115,22 @@ export const getWeb3 = (state: State): ?Web3Instance => {
if (!locationState.network) return null;
return state.web3.find(w3 => w3.network === locationState.network);
};
export const observeChanges = (prev: ?(Object | Array<any>), current: ?(Object | Array<any>), fields?: Array<string>): boolean => {
if (prev !== current) {
// 1. one of the objects is null/undefined
if (!prev || !current) return true;
// 2. object are Arrays and they have different length
if (Array.isArray(prev) && Array.isArray(current)) return prev.length !== current.length;
// 3. no nested field to check
if (!Array.isArray(fields)) return true;
// 4. validate nested field
if (prev instanceof Object && current instanceof Object) {
for (let i = 0; i < fields.length; i++) {
const key = fields[i];
if (prev[key] !== current[key]) return true;
}
}
}
return false;
};