d3plus-common/es/src/accessor.js

Common functions and methods used across D3plus modules.

/**
    @function accessor
    @desc Wraps an object key in a simple accessor function.
    @param {String} key The key to be returned from each Object passed to the function.
    @param {*} [def] A default value to be returned if the key is not present.
    @example <caption>this</caption>
accessor("id");
    @example <caption>returns this</caption>
function(d) {
  return d["id"];
}
*/
export default function(key, def) {
  if (def === void 0) { return function (d) { return d[key]; }; }
  return function (d) { return d[key] === void 0 ? def : d[key]; };
}

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