partial.js

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- # partial.js

- ¶

      import restArguments from './restArguments.js';
      import executeBound from './_executeBound.js';
      import _ from './underscore.js';

- ¶

  Partially apply a function by creating a version that has had some of its arguments pre-filled, without changing its dynamic `this` context. `_` acts as a placeholder by default, allowing any combination of arguments to be pre-filled. Set `_.partial.placeholder` for a custom placeholder argument.

      var partial = restArguments(function(func, boundArgs) {
        var placeholder = partial.placeholder;
        var bound = function() {
          var position = 0, length = boundArgs.length;
          var args = Array(length);
          for (var i = 0; i < length; i++) {
            args[i] = boundArgs[i] === placeholder ? arguments[position++] : boundArgs[i];
          }
          while (position < arguments.length) args.push(arguments[position++]);
          return executeBound(func, bound, this, this, args);
        };
        return bound;
      });

      partial.placeholder = _;
      export default partial;