om/node_modules/rxjs/_esm5/internal/operators/pluck.js

/** PURE_IMPORTS_START _map PURE_IMPORTS_END */
import { map } from './map';
export function pluck() {
    var properties = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        properties[_i] = arguments[_i];
    }
    var length = properties.length;
    if (length === 0) {
        throw new Error('list of properties cannot be empty.');
    }
    return function (source) { return map(plucker(properties, length))(source); };
}
function plucker(props, length) {
    var mapper = function (x) {
        var currentProp = x;
        for (var i = 0; i < length; i++) {
            var p = currentProp[props[i]];
            if (typeof p !== 'undefined') {
                currentProp = p;
            }
            else {
                return undefined;
            }
        }
        return currentProp;
    };
    return mapper;
}
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