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1 | var isInteger = require('./isInteger');
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2 |
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3 | /** Used as references for various `Number` constants. */
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4 | var MAX_SAFE_INTEGER = 9007199254740991;
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5 |
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6 | /**
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7 | * Checks if `value` is a safe integer. An integer is safe if it's an IEEE-754
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8 | * double precision number which isn't the result of a rounded unsafe integer.
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9 | *
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10 | * **Note:** This method is based on
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11 | * [`Number.isSafeInteger`](https://mdn.io/Number/isSafeInteger).
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12 | *
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13 | * @static
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14 | * @memberOf _
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15 | * @since 4.0.0
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16 | * @category Lang
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17 | * @param {*} value The value to check.
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18 | * @returns {boolean} Returns `true` if `value` is a safe integer, else `false`.
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19 | * @example
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20 | *
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21 | * _.isSafeInteger(3);
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22 | * // => true
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23 | *
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24 | * _.isSafeInteger(Number.MIN_VALUE);
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25 | * // => false
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26 | *
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27 | * _.isSafeInteger(Infinity);
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28 | * // => false
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29 | *
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30 | * _.isSafeInteger('3');
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31 | * // => false
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32 | */
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33 | function isSafeInteger(value) {
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34 | return isInteger(value) && value >= -MAX_SAFE_INTEGER && value <= MAX_SAFE_INTEGER;
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35 | }
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36 |
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37 | module.exports = isSafeInteger;
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