toSafeInteger.js

import toInteger from './toInteger.js'

/** Used as references for various `Number` constants. */
const MAX_SAFE_INTEGER = 9007199254740991

/**
 * Converts `value` to a safe integer. A safe integer can be compared and
 * represented correctly.
 *
 * @since 4.0.0
 * @category Lang
 * @param {*} value The value to convert.
 * @returns {number} Returns the converted integer.
 * @example
 *
 * toSafeInteger(3.2)
 * // => 3
 *
 * toSafeInteger(Number.MIN_VALUE)
 * // => 0
 *
 * toSafeInteger(Infinity)
 * // => 9007199254740991
 *
 * toSafeInteger('3.2')
 * // => 3
 */
function toSafeInteger(value) {
  if (!value) {
    return value === 0 ? value : 0
  }
  value = toInteger(value)
  if (value < -MAX_SAFE_INTEGER) {
    return -MAX_SAFE_INTEGER
  }
  if (value > MAX_SAFE_INTEGER) {
    return MAX_SAFE_INTEGER
  }
  return value
}

export default toSafeInteger