inRange.js 1.24 KB
define([], function() {

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

  /* Native method references for those with the same name as other `lodash` methods. */
  var nativeMax = Math.max,
      nativeMin = Math.min;

  /**
   * Checks if `n` is between `start` and up to but not including, `end`. If
   * `end` is not specified it's set to `start` with `start` then set to `0`.
   *
   * @static
   * @memberOf _
   * @category Number
   * @param {number} n The number to check.
   * @param {number} [start=0] The start of the range.
   * @param {number} end The end of the range.
   * @returns {boolean} Returns `true` if `n` is in the range, else `false`.
   * @example
   *
   * _.inRange(3, 2, 4);
   * // => true
   *
   * _.inRange(4, 8);
   * // => true
   *
   * _.inRange(4, 2);
   * // => false
   *
   * _.inRange(2, 2);
   * // => false
   *
   * _.inRange(1.2, 2);
   * // => true
   *
   * _.inRange(5.2, 4);
   * // => false
   */
  function inRange(value, start, end) {
    start = +start || 0;
    if (end === undefined) {
      end = start;
      start = 0;
    } else {
      end = +end || 0;
    }
    return value >= nativeMin(start, end) && value < nativeMax(start, end);
  }

  return inRange;
});