@deck.gl/core/dist/utils/memoize.js

deck.gl core library

// deck.gl
// SPDX-License-Identifier: MIT
// Copyright (c) vis.gl contributors
function isEqual(a, b) {
    if (a === b) {
        return true;
    }
    if (Array.isArray(a)) {
        // Special treatment for arrays: compare 1-level deep
        // This is to support equality of matrix/coordinate props
        const len = a.length;
        if (!b || b.length !== len) {
            return false;
        }
        for (let i = 0; i < len; i++) {
            if (a[i] !== b[i]) {
                return false;
            }
        }
        return true;
    }
    return false;
}
/**
 * Speed up consecutive function calls by caching the result of calls with identical input
 * https://en.wikipedia.org/wiki/Memoization
 * @param {function} compute - the function to be memoized
 */
export default function memoize(compute) {
    let cachedArgs = {};
    let cachedResult;
    return (args) => {
        for (const key in args) {
            if (!isEqual(args[key], cachedArgs[key])) {
                cachedResult = compute(args);
                cachedArgs = args;
                break;
            }
        }
        return cachedResult;
    };
}
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