ethers.js/docs/api/utils/fixednumber/index.html
2020-02-25 14:57:11 -05:00

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<html><head><title>FixedNumber</title><link rel="stylesheet" type="text/css" href="/static/style.css"></head><body><div class="sidebar"><div class="header"><div class="logo"><a href="/"><div class="image"></div><div class="name">ethers</div><div class="version">v5.0-beta</div></a></div></div><div class="toc"><div><div class="link title"><a href="/">Documentation</a></div><div class="base show link depth-1"><a href="/getting-started/">Getting Started</a></div><div class="hide link depth-2"><a href="/getting-started/#getting-started--installing">Installing</a></div><div class="hide link depth-2"><a href="/getting-started/#getting-started--importing">Importing</a></div><div class="base show link depth-1"><a href="/concepts/">Concepts</a></div><div class="hide link depth-2"><a href="/concepts/events/">Events</a></div><div class="hide link depth-3"><a href="/concepts/events/#events--solidity-topics">Solidity Topics</a></div><div class="hide link depth-2"><a 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<p>A <b>FixedNumber</b> is a fixed-width (in bits) number with an internal base-10 divisor, which allows it to represent a decimal fractional component.</p>
<a name="fixednumber--creating-instances"></a><h2 class="show-anchors"><div>Creating Instances<div class="anchors"><a class="self" href="#fixednumber--creating-instances"></a></div></div></h2>
<p>The FixedNumber constructor cannot be called directly. There are several static methods for creating a FixedNumber.</p>
<div class="property show-anchors"><div class="signature"><span class="path">FixedNumber</span> . <span class="method">from</span> ( <span class="param">value</span> [ , <span class="param">format</span> = <span class="default-value">"</span><span class="param">fixed</span>" ] ) <span class="arrow">&rArr;</span> <span class="returns"><a href="/api/utils/fixednumber/">FixedNumber</a></span><div class="anchors"><a class="source" href="https://github.com/ethers-io/ethers.js/blob/ethers-v5-beta/packages/bignumber/src.ts/fixednumber.ts#L323">source</a></div></div><div class="body"><p>Returns an instance of a <b>FixedNumber</b> for <i>value</i> as a <i>format</i>.</p></div></div>
<div class="property show-anchors"><div class="signature"><span class="path">FixedNumber</span> . <span class="method">fromBytes</span> ( <span class="param">aBytesLike</span> [ , <span class="param">format</span> = <span class="default-value">"</span><span class="param">fixed</span>" ] ) <span class="arrow">&rArr;</span> <span class="returns"><a href="/api/utils/fixednumber/">FixedNumber</a></span><div class="anchors"><a class="source" href="https://github.com/ethers-io/ethers.js/blob/ethers-v5-beta/packages/bignumber/src.ts/fixednumber.ts#L305">source</a></div></div><div class="body"><p>Returns an instance of a <b>FixedNumber</b> for <i>value</i> as a <i>format</i>.</p></div></div>
<div class="property show-anchors"><div class="signature"><span class="path">FixedNumber</span> . <span class="method">fromString</span> ( <span class="param">value</span> [ , <span class="param">format</span> = <span class="default-value">"</span><span class="param">fixed</span>" ] ) <span class="arrow">&rArr;</span> <span class="returns"><a href="/api/utils/fixednumber/">FixedNumber</a></span><div class="anchors"><a class="source" href="https://github.com/ethers-io/ethers.js/blob/ethers-v5-beta/packages/bignumber/src.ts/fixednumber.ts#L281">source</a></div></div><div class="body"><p>Returns an instance of a <b>FixedNumber</b> for <i>value</i> as a <i>format</i>. The <i>value</i> must not contain more decimals than the <i>format</i> permits.</p></div></div>
<div class="property show-anchors"><div class="signature"><span class="path">FixedNumber</span> . <span class="method">fromValue</span> ( <span class="param">value</span> [ , <span class="param">decimals</span> = <span class="default-value">0</span> [ , <span class="param">format</span> = <span class="default-value">"</span><span class="param">fixed</span>" ] ] ) <span class="arrow">&rArr;</span> <span class="returns"><a href="/api/utils/fixednumber/">FixedNumber</a></span><div class="anchors"><a class="source" href="https://github.com/ethers-io/ethers.js/blob/ethers-v5-beta/packages/bignumber/src.ts/fixednumber.ts#L267">source</a></div></div><div class="body"><p>Returns an instance of a <b>FixedNumber</b> for <i>value</i> with <i>decimals</i> as a <i>format</i>.</p></div></div>
<a name="fixednumber--properties"></a><h2 class="show-anchors"><div>Properties<div class="anchors"><a class="self" href="#fixednumber--properties"></a></div></div></h2>
<div class="property show-anchors"><div class="signature"><span class="path">fixednumber</span> . <span class="method">format</span><div class="anchors"></div></div><div class="body"><p>The <a href="/api/utils/fixednumber/#fixedformat">FixedFormat</a> of <i>fixednumber</i>.</p></div></div>
<a name="fixednumber--methods"></a><h2 class="show-anchors"><div>Methods<div class="anchors"><a class="self" href="#fixednumber--methods"></a></div></div></h2>
<a name="fixednumber--methods--math-operations"></a><h3 class="show-anchors"><div>Math Operations<div class="anchors"><a class="self" href="#fixednumber--methods--math-operations"></a></div></div></h3>
<div class="property show-anchors"><div class="signature"><span class="path">fixednumber</span> . <span class="method">addUnsafe</span> ( <span class="param">otherValue</span> ) <span class="arrow">&rArr;</span> <span class="returns"><a href="/api/utils/fixednumber/">FixedNumber</a></span><div class="anchors"><a class="source" href="https://github.com/ethers-io/ethers.js/blob/ethers-v5-beta/packages/bignumber/src.ts/fixednumber.ts#L203">source</a></div></div><div class="body"><p>Returns a new FixedNumber with the value of <i>fixedvalue</i> <b>+</b> <i>otherValue</i>.</p></div></div>
<div class="property show-anchors"><div class="signature"><span class="path">fixednumber</span> . <span class="method">subUnsafe</span> ( <span class="param">otherValue</span> ) <span class="arrow">&rArr;</span> <span class="returns"><a href="/api/utils/fixednumber/">FixedNumber</a></span><div class="anchors"><a class="source" href="https://github.com/ethers-io/ethers.js/blob/ethers-v5-beta/packages/bignumber/src.ts/fixednumber.ts#L210">source</a></div></div><div class="body"><p>Returns a new FixedNumber with the value of <i>fixedvalue</i> <b>&ndash;</b> <i>otherValue</i>.</p></div></div>
<div class="property show-anchors"><div class="signature"><span class="path">fixednumber</span> . <span class="method">mulUnsafe</span> ( <span class="param">otherValue</span> ) <span class="arrow">&rArr;</span> <span class="returns"><a href="/api/utils/fixednumber/">FixedNumber</a></span><div class="anchors"><a class="source" href="https://github.com/ethers-io/ethers.js/blob/ethers-v5-beta/packages/bignumber/src.ts/fixednumber.ts#L217">source</a></div></div><div class="body"><p>Returns a new FixedNumber with the value of <i>fixedvalue</i> <b>&times;</b> <i>otherValue</i>.</p></div></div>
<div class="property show-anchors"><div class="signature"><span class="path">fixednumber</span> . <span class="method">divUnsafe</span> ( <span class="param">otherValue</span> ) <span class="arrow">&rArr;</span> <span class="returns"><a href="/api/utils/fixednumber/">FixedNumber</a></span><div class="anchors"><a class="source" href="https://github.com/ethers-io/ethers.js/blob/ethers-v5-beta/packages/bignumber/src.ts/fixednumber.ts#L224">source</a></div></div><div class="body"><p>Returns a new FixedNumber with the value of <i>fixedvalue</i> <b>&#247;</b> <i>otherValue</i>.</p></div></div>
<div class="property show-anchors"><div class="signature"><span class="path">fixednumber</span> . <span class="method">round</span> ( [ <span class="param">decimals</span> = <span class="default-value">0</span> ] ) <span class="arrow">&rArr;</span> <span class="returns"><a href="/api/utils/fixednumber/">FixedNumber</a></span><div class="anchors"><a class="source" href="https://github.com/ethers-io/ethers.js/blob/ethers-v5-beta/packages/bignumber/src.ts/fixednumber.ts#L232">source</a></div></div><div class="body"><p>Returns a new FixedNumber with the value of <i>fixedvalue</i> rounded to <i>decimals</i>.</p></div></div>
<a name="fixednumber--methods--conversion"></a><h3 class="show-anchors"><div>Conversion<div class="anchors"><a class="self" href="#fixednumber--methods--conversion"></a></div></div></h3>
<div class="property show-anchors"><div class="signature"><span class="path">fixednumber</span> . <span class="method">toFormat</span> ( <span class="param">format</span> ) <span class="arrow">&rArr;</span> <span class="returns"><a href="/api/utils/fixednumber/">FixedNumber</a></span><div class="anchors"><a class="source" href="https://github.com/ethers-io/ethers.js/blob/ethers-v5-beta/packages/bignumber/src.ts/fixednumber.ts#L262">source</a></div></div><div class="body"><p>Returns a new FixedNumber with the value of <i>fixedvalue</i> with <i>format</i>.</p></div></div>
<div class="property show-anchors"><div class="signature"><span class="path">fixednumber</span> . <span class="method">toHexString</span> ( ) <span class="arrow">&rArr;</span> <span class="returns">string</span><div class="anchors"><a class="source" href="https://github.com/ethers-io/ethers.js/blob/ethers-v5-beta/packages/bignumber/src.ts/fixednumber.ts#L253">source</a></div></div><div class="body"><p>Returns a <a href="/api/utils/bytes/#hexstring">Hexstring</a> representation of <i>fixednumber</i>.</p></div></div>
<div class="property show-anchors"><div class="signature"><span class="path">fixednumber</span> . <span class="method">toString</span> ( ) <span class="arrow">&rArr;</span> <span class="returns">string</span><div class="anchors"><a class="source" href="https://github.com/ethers-io/ethers.js/blob/ethers-v5-beta/packages/bignumber/src.ts/fixednumber.ts#L251">source</a></div></div><div class="body"><p>Returns a string representation of <i>fixednumber</i>.</p></div></div>
<div class="property show-anchors"><div class="signature"><span class="path">fixednumber</span> . <span class="method">toUnsafeFloat</span> ( ) <span class="arrow">&rArr;</span> <span class="returns">float</span><div class="anchors"><a class="source" href="https://github.com/ethers-io/ethers.js/blob/ethers-v5-beta/packages/bignumber/src.ts/fixednumber.ts#L260">source</a></div></div><div class="body"><p>Returns a floating-point JavaScript number value of <i>fixednumber</i>. Due to rounding in JavaScript numbers, the value is only approximate.</p></div></div>
<a name="fixednumber--methods--inspection"></a><h3 class="show-anchors"><div>Inspection<div class="anchors"><a class="self" href="#fixednumber--methods--inspection"></a></div></div></h3>
<div class="property show-anchors"><div class="signature"><span class="path">FixedNumber</span> . <span class="method">isFixedNumber</span> ( <span class="param">value</span> ) <span class="arrow">&rArr;</span> <span class="returns">boolean</span><div class="anchors"><a class="source" href="https://github.com/ethers-io/ethers.js/blob/ethers-v5-beta/packages/bignumber/src.ts/fixednumber.ts#L344">source</a></div></div><div class="body"><p>Returns true if and only if <i>value</i> is a <b>FixedNumber</b>.</p></div></div>
<a name="fixedformat"></a><a name="fixednumber--fixedformat"></a><a name="fixedformat"></a><h2 class="show-anchors"><div>FixedFormat<div class="anchors"><a class="self" href="#fixedformat"></a></div></div></h2>
<p>A <b>FixedFormat</b> is a simple object which represents a decimal (base-10) Fixed-Point data representation. Usually using this class directly is uneccessary, as passing in a <a href="/api/utils/fixednumber/#fixedformatstring">Format Strings</a> directly into the <a href="/api/utils/fixednumber/">FixedNumber</a> will automatically create this.</p>
<a name="fixedformatstring"></a><a name="fixednumber--fixedformat--fixedformatstring"></a><a name="fixedformatstring"></a><h3 class="show-anchors"><div>Format Strings<div class="anchors"><a class="self" href="#fixedformatstring"></a></div></div></h3>
<p>A format string is composed of three components, including signed-ness, bit-width and number of decimals.</p><p>A signed format string begins with <code class="inline">fixed</code>, which an unsigned format string begins with <code class="inline">ufixed</code>, followed by the width (in bits) and the number of decimals.</p><p>The width must be conguent to 0 mod 8 (i.e. <code class="inline">(width % 8) == 0</code>) and no larger than 256 bits and the number of decimals must be no larger than 80.</p><p>For example:</p><ul><li><b>fixed128x18</b> is signed, 128 bits wide and has 18 decimals; this is useful for most purposes</li><li><b>fixed32x0</b> is signed, 32 bits wide and has 0 decimals; this would be the same as a ``int32_t` in C</li><li><b>ufixed32x0</b> is unsigned, 32 bits wide and has 0 decimals; this would be the same as a ``uint32_t` in C</li><li><b>fixed</b> is shorthand for ``fixed128x18`</li><li><b>ufixed</b> is shorthand for ``ufixed128x18`</li></ul>
<a name="fixednumber--fixedformat--creating-instances"></a><h3 class="show-anchors"><div>Creating Instances<div class="anchors"><a class="self" href="#fixednumber--fixedformat--creating-instances"></a></div></div></h3>
<a name="fixednumber-from"></a><div class="property show-anchors"><div class="signature"><span class="path">FixedFormat</span> . <span class="method">from</span> ( <span class="param">value</span> = <span class="default-value">"</span><span class="param">fixed128x18</span>" ) <span class="arrow">&rArr;</span> <span class="returns"><a href="/api/utils/fixednumber/#fixedformat">FixedFormat</a></span><div class="anchors"><a class="self" href="#fixednumber-from"></a><a class="source" href="https://github.com/ethers-io/ethers.js/blob/ethers-v5-beta/packages/bignumber/src.ts/fixednumber.ts#L134">source</a></div></div><div class="body"><p>Returns a new instance of a <b>FixedFormat</b> defined by <i>value</i>. Any valid <a href="/api/utils/fixednumber/#fixedformatstring">Format Strings</a> may be passed in as well as any object which has any of <code class="inline">signed</code>, <code class="inline">width</code> and <code class="inline">decimals</code> defined, including a <a href="/api/utils/fixednumber/#fixedformat">FixedFormat</a> object.</p></div></div>
<a name="fixednumber--fixedformat--properties"></a><h3 class="show-anchors"><div>Properties<div class="anchors"><a class="self" href="#fixednumber--fixedformat--properties"></a></div></div></h3>
<div class="property show-anchors"><div class="signature"><span class="path">fixedFormat</span> . <span class="method">signed</span> <span class="arrow">&rArr;</span> <span class="returns">boolean</span><div class="anchors"></div></div><div class="body"><p>The signed-ness of <i>fixedFormat</i>, true if negative values are supported.</p></div></div>
<div class="property show-anchors"><div class="signature"><span class="path">fixedFormat</span> . <span class="method">width</span> <span class="arrow">&rArr;</span> <span class="returns">number</span><div class="anchors"></div></div><div class="body"><p>The width (in bits) of <i>fixedFormat</i>.</p></div></div>
<div class="property show-anchors"><div class="signature"><span class="path">fixedFormat</span> . <span class="method">decimals</span> <span class="arrow">&rArr;</span> <span class="returns">number</span><div class="anchors"></div></div><div class="body"><p>The number of decimal points of <i>fixedFormat</i>.</p></div></div>
<div class="property show-anchors"><div class="signature"><span class="path">fixedFormat</span> . <span class="method">name</span> <span class="arrow">&rArr;</span> <span class="returns">string</span><div class="anchors"></div></div><div class="body"><p>The name of the <i>fixedFormat</i>, which can be used to recreate the format and is the string that the Solidity language uses to represent this format.</p></div></div>
<div class="definition show-anchors"><div class="term"><b><i>"fixed"</i></b></div><div class="body"><p>A shorthand for <code class="inline">fixed128x80</code>.</p></div></div><div class="footer"><div class="nav previous"><a href="/api/utils/encoding/"><span class="arrow">&larr;</span>Encoding Utilities</a></div> <div class="nav next"><a href="/api/utils/hashing/">Hashing Algorithms<span class="arrow">&rarr;</span></a></div></div><div class="copyright">The content of this site is licensed under the <a href="https://choosealicense.com/licenses/cc-by-4.0/">Creative Commons Attribution 4.0 International License</a>.</div></div><script src="/script.js" type="text/javascript"></script></body></html><!-- ContentHash:336a7055d8c9c3b8b03c227a15f0a9ac02667010f5e4a76ca3663dfca8fcc126 -->