generate-compare-function/lib/esm/generate-compare-function.js

generate compare function by object paths.

import generateFunction from 'generate-function';
export function generateCompareFunction(paths) {
    var generator = generateFunction();
    generator("\n    function compare(object1, object2) {\n      return (\n        " + paths.map(function (path) {
        return "(" + createSafeObjectRefs(generator, 'object1', path) + ") === (" + createSafeObjectRefs(generator, 'object2', path) + ")";
    }).join(' && ') + "\n      );\n    }\n  ");
    return generator.toFunction();
}
;
/**
 * createSafeObjectRefs
 *
 * Usage:
 *   createSafeObjectRefs('state1', ['path', 'to', 'value'])
 *   ↓↓↓
 *   `(state1 && state1.path && state1.path.to && state1.path.to.value)`
 */
var createSafeObjectRefs = function (generator, name, paths) {
    return paths.reduce(function (refs, path) {
        return refs.concat(generator.property(refs[refs.length - 1], path));
    }, [name]).join(' && ');
};
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