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    <pre><code>var intvalue = Math.floor( floatvalue ); var intvalue = Math.ceil( floatvalue ); var intvalue = Math.round( floatvalue ); // `Math.trunc` was added in ECMAScript 6 var intvalue = Math.trunc( floatvalue ); </code></pre> <p><a href="https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Math" rel="noreferrer">Math object reference</a></p> <hr> <h3>Examples</h3> <strong>Positive</strong> <pre><code>value = 5.5 Math.floor(value) // 5 Math.ceil(value) // 6 Math.round(value) // 6 Math.trunc(value) // 5 parseInt(value) // 5 ~~value // 5 value | 0 // 5 value &gt;&gt; 0 // 5 value &gt;&gt;&gt; 0 // 5 value - value % 1 // 5 </code></pre> <strong>Negative</strong> <pre><code>value = -5.5 Math.floor(value) // -6 Math.ceil(value) // -5 Math.round(value) // -5 Math.trunc(value) // -5 parseInt(value) // -5 value | 0 // -5 ~~value // -5 value &gt;&gt; 0 // -5 value &gt;&gt;&gt; 0 // 4294967291 value - value % 1 // -5 </code></pre> <strong>Positive - Larger numbers</strong> <pre><code>value = Number.MAX_SAFE_INTEGER/10 // 900719925474099.1 Math.floor(value) // 900719925474099 Math.ceil(value) // 900719925474100 Math.round(value) // 900719925474099 Math.trunc(value) // 900719925474099 parseInt(value) // 900719925474099 value | 0 // 858993459 ~~value // 858993459 value &gt;&gt; 0 // 858993459 value &gt;&gt;&gt; 0 // 858993459 value - value % 1 // 900719925474099 </code></pre> <strong>Negative - Larger numbers</strong> <pre><code>value = Number.MAX_SAFE_INTEGER/10 * -1 // -900719925474099.1 Math.floor(value) // -900719925474100 Math.ceil(value) // -900719925474099 Math.round(value) // -900719925474099 Math.trunc(value) // -900719925474099 parseInt(value) // -900719925474099 value | 0 // -858993459 ~~value // -858993459 value &gt;&gt; 0 // -858993459 value &gt;&gt;&gt; 0 // 3435973837 value - value % 1 // -900719925474099 </code></pre>
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    1. POHow do I convert a float number to a whole number in JavaScript?
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    1. COAs mentioned in another answer, a negative-safe truncate can be done using `var intValue = ~~floatValue;`. If the notation is too obscure for your tastes, just hide it in a function: `function toInt(value) { return ~~value; }`. (This also converts strings to integers, if you care to do so.)
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