prettycats/dist/predicates/numbers.js

Helpful, common, and curried predicates library built on Ramda.

'use strict';

var R = require('ramda'),
    __ = require('./_private.js');

var isNumberBetween = R.curry(function (min, max, n) {
  return R.is(Number, n) && n > min && n < max;
});
var isNumberBetweenInclusive = R.curry(function (min, max, n) {
  return R.is(Number, n) && n >= min && n <= max;
});
var numberIsOneOf = R.curry(function (selectionArr, num) {
  return R.allPass([R.is(Number), R.contains(R.__, selectionArr)])(num);
});

var isNumber = R.is(Number),
    isPositiveNumber = R.allPass([isNumber, R.gt(R.__, 0)]),
    isAtLeastZero = R.allPass([isNumber, R.gte(R.__, 0)]),
    isNegativeNumber = R.allPass([isNumber, R.lt(R.__, 0)]),
    isAtMostZero = R.allPass([isNumber, R.lte(R.__, 0)]),
    isCalendarMonth = isNumberBetweenInclusive(1, 12),
    isCalendarMonthZeroBased = isNumberBetweenInclusive(0, 11),
    isEvenNumber = __.modTwoEq(0),
    isOddNumber = __.modTwoEq(1),
    isNumeric = function isNumeric(v) {
  return !isNaN(parseInt(v, 10));
},
    isNumericBoolean = R.contains(R.__, [0, 1]);

module.exports = {
  isNumber: isNumber,
  isNumberBetween: isNumberBetween,
  isNumberBetweenInclusive: isNumberBetweenInclusive,
  isPositiveNumber: isPositiveNumber,
  isNegativeNumber: isNegativeNumber,
  isEvenNumber: isEvenNumber,
  isOddNumber: isOddNumber,
  isAtLeastZero: isAtLeastZero,
  isAtMostZero: isAtMostZero,
  isCalendarMonth: isCalendarMonth,
  isCalendarMonthZeroBased: isCalendarMonthZeroBased,
  numberIsOneOf: numberIsOneOf,
  isNumeric: isNumeric,
  isNumericBoolean: isNumericBoolean
};
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