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perf: resolveObjectKey (#8434)

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* perf: resolveObjectKey
* Fix tests
* prevent string construction
This commit is contained in:
Jukka Kurkela 2021-02-15 23:15:58 +02:00 committed by GitHub
parent 19a91bebfb
commit 616a877772
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1 changed files with 16 additions and 12 deletions
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28
src/helpers/helpers.core.js
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@ -283,22 +283,26 @@ export function _deprecated(scope, value, previous, current) {
}
}
const emptyString = '';
const dot = '.';
function indexOfDotOrLength(key, start) {
const idx = key.indexOf(dot, start);
return idx === -1 ? key.length : idx;
}
export function resolveObjectKey(obj, key) {
// Special cases for `x` and `y` keys. It's quite a lot faster to aceess this way.
// Those are the default keys Chart.js is resolving, so it makes sense to be fast.
if (key === 'x') {
return obj.x;
if (key === emptyString) {
return obj;
}
if (key === 'y') {
return obj.y;
}
const keys = key.split('.');
for (let i = 0, n = keys.length; i < n && obj; ++i) {
const k = keys[i];
if (!k) {
let pos = 0;
let idx = indexOfDotOrLength(key, pos);
while (idx > pos) {
obj = obj[key.substr(pos, idx - pos)];
if (!obj) {
break;
}
obj = obj[k];
pos = idx + 1;
idx = indexOfDotOrLength(key, pos);
}
return obj;
}