调用iteratee n次，每次调用返回的结果存入到数组中

/**
 * 调用iteratee `n`次，每次调用返回的结果存入到数组中，iteratee调入一个参数:index
 * Invokes the iteratee `n` times, returning an array of the results of each invocation.
 * The iteratee is invoked with one arguments (index)
 *
 * @param {number} n The number of times to invoke `iteratee`
 * @param {Function} [iteratee=_.identity] The function invoked per iteration.
 * @returns {Array} Returns the array of results
 * @example
 *
 * times(3, String);
 * // ['0', '1', '2']
 *
 * times(7, value => value * 2)
 * // => 0,2,4,6,8,10,12
 */

import toInteger from "./toInteger"
const MAX_ARRAY_LENGTH = 4294967295 //Used as references for the maximum length and index of an array

function baseTimes(n, iteratee) {
  let index = -1,
    result = Array(n)

  while (++index < n) {
    result[index] = iteratee(index)
  }
  return result
}

function times(n, iteratee) {
  n = toInteger(n)
  if (n < 1 || n > Number.MAX_SAFE_INTEGER) {
    return []
  }
  const length = Math.min(n, MAX_ARRAY_LENGTH)
  return baseTimes(length, iteratee)
}

export default times

/**
 * 转换value为整数
 * Converts `value` to an integer.
 *
 * @param {*} value The value to convert.
 * @returns {number} Returns the converted integer.
 * @example
 *
 * toInteger(3.3)
 * // => 3
 *
 * toInteger('3.3')
 * // => 3
 *
 * toInteger(Number.MIN_VALUE)
 * // => 0
 *
 * toInteger(Infinity)
 * // => 1.7976931348623157e+308
 *
 * toInteger(-3.3)
 * // => -3
 *
 * toInteger(new Date())
 * // => 1561453581720
 *
 * toInteger(() => {})
 * // => 0
 */
 
const NAN = 0 / 0
const INFINITY = 1 / 0
const symbolTag = "[object Symbol]"
const MAX_INTEGER = Number.MAX_VALUE || 1.7976931348623157e308
 
function isObjectLike(value) {
  return typeof value == "object" && value !== null
}
 
function isSymbol(value) {
  return (
    typeof value === "symbol" ||
    (isObjectLike(value) && Object.prototype.toString.call(value) === symbolTag)
  )
}
 
function toNumber(value) {
  if (typeof value === "number") {
    return value
  }
  if (isSymbol(value)) {
    return NAN
  }
  return Number(value)
}
 
function toFinite(value) {
  if (!value) {
    return value === 0 ? value : 0
  }
  value = toNumber(value)
  if (value === INFINITY || value === -INFINITY) {
    var sign = value < 0 ? -1 : 1 //可用Math.sign代替
    return sign * MAX_INTEGER
  }
  return value === value ? value : 0 //NaN 不等于 NaN
}
 
function toInteger(value) {
  var result = toFinite(value)
  var remainder = result % 1
  return result === result ? (remainder ? result - remainder : result) : 0 //可用Math.trunc代替
}
 
export default toInteger