/**
 * Shallow filters out redundant members.
 * @example
 * uniques([0, 1, 2, 2, 3, 3])  // => [0, 1, 2, 3]
 */
export declare function uniques(arr: any[]): any[];
/**
 * Shallow checks for repeat members.
 * @example
 * has_repeat([1, 2, 3])  // => false
 * has_repeat([1, 2, 1])  // => true
 */
export declare function hasRepeat(arr: any[]): boolean;
/**
 * Choose random member in array.
 * @example
 * randChoose([1, 'a', null])  // => 1
 * randChoose([1, 'a', null])  // => null
 */
export declare function randChoose(arr: any[]): any;
/**
 * A function for quickly generating arrays populated by a range of integers,
 * with an optional skip interval.
 *
 * @example
 * range(3)          // => [0, 1, 2, 3]
 * range(-3)         // => [0, -1, -2, -3]
 * range(-2, 2)      // => [-2, -1, 0, 1, 2]
 * range(2, -2)      // => [2, 1, 0, -1, -2]
 * range(-10, 10, 5) // => [-10, -5, 0, 5, 10]
 * range(10, -10, 5) // => [10, 5, 0, -5, -10]
 */
export declare function range(p0: number, pf?: number, skip?: number): number[];
/**
 * Uses `λ` to populate an array of `items` length.
 *
 * @example
 * series(x => 0.5*x**2 + 0.5*x, 5)  // => [0, 1, 3, 6, 10]
 */
export declare function series(λ: Function, items?: number): any[];
/**
 * Returns a shallow copy of the last value of your array. The default behavior
 * is to return `undefined` on an empty array while `throwOnEmpty` is set to
 * `false`.
 *
 * @example
 * last([3, 2, 1])       // => 1
 * last([3, 2, [1, 0]])  // => [1, 0]
 * last([null])          // => null
 * last([])              // => undefined if throwOnEmpty is false (!)
 */
export declare function last(arr: any[], throwOnEmpty?: boolean): any;