githubmirror/lodash

dropRight.js

42 строки1 KB

John-David Dalton

Bump to v4.16.5.

31 окт 2016, 06:06

31 окт 2016, 06:06b58a63e

define(['./_baseSlice', './toInteger'], function(baseSlice, toInteger) {

  /** Used as a safe reference for `undefined` in pre-ES5 environments. */
  var undefined;

  /**
   * Creates a slice of `array` with `n` elements dropped from the end.
   *
   * @static
   * @memberOf _
   * @since 3.0.0
   * @category Array
   * @param {Array} array The array to query.
   * @param {number} [n=1] The number of elements to drop.
   * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
   * @returns {Array} Returns the slice of `array`.
   * @example
   *
   * _.dropRight([1, 2, 3]);
   * // => [1, 2]
   *
   * _.dropRight([1, 2, 3], 2);
   * // => [1]
   *
   * _.dropRight([1, 2, 3], 5);
   * // => []
   *
   * _.dropRight([1, 2, 3], 0);
   * // => [1, 2, 3]
   */
  function dropRight(array, n, guard) {
    var length = array == null ? 0 : array.length;
    if (!length) {
      return [];
    }
    n = (guard || n === undefined) ? 1 : toInteger(n);
    n = length - n;
    return baseSlice(array, 0, n < 0 ? 0 : n);
  }

  return dropRight;
});