Simulate named parameters in ES5 using an object literal, passing multiple parameters as a single actual parameter.

named-parameters.js

function selectEntries(options) {
    options = options || {};
    var start = options.start || 0;
    var end = options.end || -1;
    var step = options.step || 1;
    // function implementation
}

selectEntries({ start: 3, end: 20, step: 2 });