50 lines
914 B
JavaScript
50 lines
914 B
JavaScript
export function stateToggler(key) {
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return state => ({ [key]: !state[key] });
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}
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const hasOwnProperty = Object.prototype.hasOwnProperty;
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function is(x, y) {
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// SameValue algorithm
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if (x === y) {
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// Steps 1-5, 7-10
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// Steps 6.b-6.e: +0 != -0
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return x !== 0 || 1 / x === 1 / y;
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}
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// Step 6.a: NaN == NaN
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return x !== x && y !== y;
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}
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export function shallowEqual(objA, objB) {
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if (is(objA, objB)) {
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return true;
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}
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if (
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typeof objA !== "object" ||
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objA === null ||
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typeof objB !== "object" ||
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objB === null
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) {
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return false;
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}
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const keysA = Object.keys(objA);
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const keysB = Object.keys(objB);
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if (keysA.length !== keysB.length) {
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return false;
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}
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for (let i = 0; i < keysA.length; i++) {
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if (
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!hasOwnProperty.call(objB, keysA[i]) ||
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!is(objA[keysA[i]], objB[keysA[i]])
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) {
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return false;
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}
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}
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return true;
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}
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