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Add _.isInteger and _.isSafeInteger.

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This commit is contained in:
John-David Dalton
2015-09-15 20:33:36 -07:00
parent 3a81738455
commit 49266dce89
2 changed files with 88 additions and 29 deletions
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102
lodash.js
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@@ -48,21 +48,16 @@
/** Used as the `TypeError` message for "Functions" methods. */
var FUNC_ERROR_TEXT = 'Expected a function';
/** Used as references for various `Number` constants. */
var INFINITY = 1 / 0,
MAX_SAFE_INTEGER = 9007199254740991,
MAX_VALUE = 1.7976931348623157e308;
/** Used as references for the maximum length and index of an array. */
var MAX_ARRAY_LENGTH = 4294967295,
MAX_ARRAY_INDEX = MAX_ARRAY_LENGTH - 1,
HALF_MAX_ARRAY_LENGTH = MAX_ARRAY_LENGTH >>> 1;
/**
* Used as the [maximum length](http://ecma-international.org/ecma-262/6.0/#sec-number.max_safe_integer)
* of an array-like value.
*/
var MAX_SAFE_INTEGER = 9007199254740991;
/** Used as references for `-Infinity` and `Infinity`. */
var NEGATIVE_INFINITY = 1 / -0,
POSITIVE_INFINITY = 1 / 0;
/** Used as the internal argument placeholder. */
var PLACEHOLDER = '__lodash_placeholder__';
@@ -1424,9 +1419,9 @@
* `remove`, `rest`, `restParam`, `reverse`, `set`, `setWith`, `shuffle`,
* `slice`, `sort`, `sortBy`, `sortByOrder`, `splice`, `spread`, `take`,
* `takeRight`, `takeRightWhile`, `takeWhile`, `tap`, `throttle`, `thru`,
* `times`, `toArray`, `toPath`, `toPlainObject`, `transform`, `union`, `uniq`,
* `uniqBy`, `unset`, `unshift`, `unzip`, `unzipWith`, `values`, `valuesIn`,
* `without`, `wrap`, `xor`, `zip`, `zipObject`, and `zipWith`
* `times`, `toArray`, `toPath`, `toPlainObject`, `transform`, `union`,
* `uniq`, `uniqBy`, `unset`, `unshift`, `unzip`, `unzipWith`, `values`,
* `valuesIn`, `without`, `wrap`, `xor`, `zip`, `zipObject`, and `zipWith`
*
* The wrapper methods that are **not** chainable by default are:
* `add`, `attempt`, `camelCase`, `capitalize`, `ceil`, `clone`, `cloneDeep`,
@@ -1435,16 +1430,17 @@
* `findLastIndex`, `findLastKey`, `first`, `floor`, `get`, `gt`, `gte`,
* `has`, `hasIn`, `identity`, `includes`, `indexOf`, `inRange`, `isArguments`,
* `isArray`, `isArrayLike`, `isBoolean`, `isDate`, `isElement`, `isEmpty`,
* `isEqual`, `isEqualWith`, `isError`, `isFinite` `isFunction`, `isMatch`,
* `isMatchWith`, `isNaN`, `isNative`, `isNil`, `isNull`, `isNumber`, `isObject`,
* `isObjectLike`, `isPlainObject`, `isRegExp`, `isString`, `isUndefined`,
* `isTypedArray`, `join`, `kebabCase`, `last`, `lastIndexOf`, `lt`, `lte`,
* `max`, `min`, `noConflict`, `noop`, `now`, `pad`, `padLeft`, `padRight`,
* `parseInt`, `pop`, `random`, `reduce`, `reduceRight`, `repeat`, `result`,
* `round`, `runInContext`, `shift`, `size`, `snakeCase`, `some`, `sortedIndex`,
* `sortedIndexBy`, `sortedLastIndex`, `sortedLastIndexBy`, `startCase`,
* `startsWith`, `sum`, `sumBy`, `template`, `toInteger', 'trim`, `trimLeft`,
* `trimRight`, `trunc`, `unescape`, `uniqueId`, `value`, and `words`
* `isEqual`, `isEqualWith`, `isError`, `isFinite` `isFunction`, `isInteger`,
* `isMatch`, `isMatchWith`, `isNaN`, `isNative`, `isNil`, `isNull`, `isNumber`,
* `isObject`, `isObjectLike`, `isPlainObject`, `isRegExp`, `isSafeInteger`,
* `isString`, `isUndefined`, `isTypedArray`, `join`, `kebabCase`, `last`,
* `lastIndexOf`, `lt`, `lte`, `max`, `min`, `noConflict`, `noop`, `now`,
* `pad`, `padLeft`, `padRight`, `parseInt`, `pop`, `random`, `reduce`,
* `reduceRight`, `repeat`, `result`, `round`, `runInContext`, `shift`, `size`,
* `snakeCase`, `some`, `sortedIndex`, `sortedIndexBy`, `sortedLastIndex`,
* `sortedLastIndexBy`, `startCase`, `startsWith`, `sum`, `sumBy`, `template`,
* `toInteger`, `trim`, `trimLeft`, `trimRight`, `trunc`, `unescape`, `uniqueId`,
* `value`, and `words`
*
* The wrapper method `sample` will return a wrapped value when `n` is provided,
* otherwise an unwrapped value is returned.
@@ -8550,6 +8546,34 @@
return isObject(value) && objToString.call(value) == funcTag;
}
/**
* Checks if `value` is an integer.
*
* **Note:** This method is based on [`Number.isInteger`](http://ecma-international.org/ecma-262/6.0/#sec-number.isinteger).
*
* @static
* @memberOf _
* @category Lang
* @param {*} value The value to check.
* @returns {boolean} Returns `true` if `value` is an integer, else `false`.
* @example
*
* _.isInteger(3);
* // => true
*
* _.isInteger(Number.MAX_VALUE);
* // => true
*
* _.isInteger(3.14);
* // => false
*
* _.isInteger(Infinity);
* // => false
*/
function isInteger(value) {
return value === toInteger(value);
}
/**
* Checks if `value` is the [language type](https://es5.github.io/#x8) of `Object`.
* (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
@@ -8856,6 +8880,36 @@
return isObject(value) && objToString.call(value) == regexpTag;
}
/**
* Checks if `value` is a safe integer. An integer is safe if it's an IEEE-754
* double precision number which isn't the result of rounding result of unsafe
* integers.
*
* **Note:** This method is based on [`Number.isSafeInteger`](http://ecma-international.org/ecma-262/6.0/#sec-number.issafeinteger).
*
* @static
* @memberOf _
* @category Lang
* @param {*} value The value to check.
* @returns {boolean} Returns `true` if `value` is a safe integer, else `false`.
* @example
*
* _.isSafeInteger(3);
* // => true
*
* _.isSafeInteger(Number.MAX_VALUE);
* // => false
*
* _.isSafeInteger(3.14);
* // => false
*
* _.isSafeInteger(Infinity);
* // => false
*/
function isSafeInteger(value) {
return isInteger(value) && value >= -MAX_SAFE_INTEGER && value <= MAX_SAFE_INTEGER;
}
/**
* Checks if `value` is classified as a `String` primitive or object.
*
@@ -12096,6 +12150,7 @@
lodash.isError = isError;
lodash.isFinite = isFinite;
lodash.isFunction = isFunction;
lodash.isInteger = isInteger;
lodash.isMatch = isMatch;
lodash.isMatchWith = isMatchWith;
lodash.isNaN = isNaN;
@@ -12107,6 +12162,7 @@
lodash.isObjectLike = isObjectLike;
lodash.isPlainObject = isPlainObject;
lodash.isRegExp = isRegExp;
lodash.isSafeInteger = isSafeInteger;
lodash.isString = isString;
lodash.isTypedArray = isTypedArray;
lodash.isUndefined = isUndefined;

15
test/test.js
View File

@@ -9657,12 +9657,13 @@
});
QUnit.test('should not error on host objects (test in IE)', function(assert) {
assert.expect(18);
assert.expect(20);
var funcs = [
'isArguments', 'isArray', 'isArrayLike', 'isBoolean', 'isDate', 'isElement',
'isError', 'isFinite', 'isFunction', 'isNaN', 'isNil', 'isNull', 'isNumber',
'isObject', 'isObjectLike', 'isRegExp', 'isString', 'isUndefined'
'isArguments', 'isArray', 'isArrayLike', 'isBoolean', 'isDate',
'isElement', 'isError', 'isFinite', 'isFunction', 'isInteger', 'isNaN',
'isNil', 'isNull', 'isNumber', 'isObject', 'isObjectLike', 'isRegExp',
'isSafeInteger', 'isString', 'isUndefined'
];
_.each(funcs, function(methodName) {
@@ -18435,7 +18436,7 @@
assert.strictEqual(_.toInteger('3.14'), 3);
assert.strictEqual(_.toInteger(), 0);
assert.strictEqual(_.toInteger(NaN), 0);
assert.strictEqual(_.toInteger(-Infinity), -Infinity);
assert.strictEqual(_.toInteger(-Infinity), -1.7976931348623157e+308);
});
}());
@@ -20561,6 +20562,7 @@
'isError',
'isFinite',
'isFunction',
'isInteger',
'isNaN',
'isNative',
'isNil',
@@ -20570,6 +20572,7 @@
'isObjectLike',
'isPlainObject',
'isRegExp',
'isSafeInteger',
'isString',
'isUndefined',
'join',
@@ -20824,7 +20827,7 @@
var acceptFalsey = _.difference(allMethods, rejectFalsey);
QUnit.test('should accept falsey arguments', function(assert) {
assert.expect(233);
assert.expect(235);
var emptyArrays = _.map(falsey, _.constant([]));