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    <p><a href="https://stackoverflow.com/a/307200/508537">Jimmy's answer</a> correctly represents the continuous JavaScript integer spectrum as <strong>-9007199254740992</strong> to <strong>9007199254740992</strong> inclusive (sorry 9007199254740993, you might think you are 9007199254740993, but you are wrong! <em>Demonstration below or in <a href="http://jsfiddle.net/briguy37/LRY3u/" rel="nofollow noreferrer">jsfiddle</a></em>). </p> <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false"> <div class="snippet-code"> <pre class="snippet-code-js lang-js prettyprint-override"><code>document.write(9007199254740993);</code></pre> </div> </div> </p> <p>However, there is no answer that finds/proves this programatically (other than the one CoolAJ86 alluded to in <a href="https://stackoverflow.com/a/7179733/508537">his answer</a> that would finish in 28.56 years ;), so here's a slightly more efficient way to do that (to be precise, it's more efficient by about 28.559999999968312 years :), along with a <a href="http://jsfiddle.net/briguy37/P4twR/" rel="nofollow noreferrer">test fiddle</a>:</p> <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false"> <div class="snippet-code"> <pre class="snippet-code-js lang-js prettyprint-override"><code>/** * Checks if adding/subtracting one to/from a number yields the correct result. * * @param number The number to test * @return true if you can add/subtract 1, false otherwise. */ var canAddSubtractOneFromNumber = function(number) { var numMinusOne = number - 1; var numPlusOne = number + 1; return ((number - numMinusOne) === 1) &amp;&amp; ((number - numPlusOne) === -1); } //Find the highest number var highestNumber = 3; //Start with an integer 1 or higher //Get a number higher than the valid integer range while (canAddSubtractOneFromNumber(highestNumber)) { highestNumber *= 2; } //Find the lowest number you can't add/subtract 1 from var numToSubtract = highestNumber / 4; while (numToSubtract &gt;= 1) { while (!canAddSubtractOneFromNumber(highestNumber - numToSubtract)) { highestNumber = highestNumber - numToSubtract; } numToSubtract /= 2; } //And there was much rejoicing. Yay. console.log('HighestNumber = ' + highestNumber);</code></pre> </div> </div> </p>
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    1. POWhat is JavaScript's highest integer value that a number can go to without losing precision?
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    1. COWay to 1-up me man! Haha! :-D
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    2. CO@CoolAJ86: Lol, I'm looking forward to March 15, 2040. If our numbers match we should throw a party :)
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    3. COvar x=Math.pow(2,53)-3;while (x!=x+1) x++; -> 9007199254740991
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