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Filename : bind.js
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import baseRest from './_baseRest.js';
import createWrap from './_createWrap.js';
import getHolder from './_getHolder.js';
import replaceHolders from './_replaceHolders.js';

/** Used to compose bitmasks for function metadata. */
var WRAP_BIND_FLAG = 1,
    WRAP_PARTIAL_FLAG = 32;

/**
 * Creates a function that invokes `func` with the `this` binding of `thisArg`
 * and `partials` prepended to the arguments it receives.
 *
 * The `_.bind.placeholder` value, which defaults to `_` in monolithic builds,
 * may be used as a placeholder for partially applied arguments.
 *
 * **Note:** Unlike native `Function#bind`, this method doesn't set the "length"
 * property of bound functions.
 *
 * @static
 * @memberOf _
 * @since 0.1.0
 * @category Function
 * @param {Function} func The function to bind.
 * @param {*} thisArg The `this` binding of `func`.
 * @param {...*} [partials] The arguments to be partially applied.
 * @returns {Function} Returns the new bound function.
 * @example
 *
 * function greet(greeting, punctuation) {
 *   return greeting + ' ' + this.user + punctuation;
 * }
 *
 * var object = { 'user': 'fred' };
 *
 * var bound = _.bind(greet, object, 'hi');
 * bound('!');
 * // => 'hi fred!'
 *
 * // Bound with placeholders.
 * var bound = _.bind(greet, object, _, '!');
 * bound('hi');
 * // => 'hi fred!'
 */
var bind = baseRest(function(func, thisArg, partials) {
  var bitmask = WRAP_BIND_FLAG;
  if (partials.length) {
    var holders = replaceHolders(partials, getHolder(bind));
    bitmask |= WRAP_PARTIAL_FLAG;
  }
  return createWrap(func, bitmask, thisArg, partials, holders);
});

// Assign default placeholders.
bind.placeholder = {};

export default bind;