102 lines
2.0 KiB
Markdown
102 lines
2.0 KiB
Markdown
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<!--
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@license Apache-2.0
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Copyright (c) 2018 The Stdlib Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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# isInteger
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> Test if a finite [double-precision floating-point number][ieee754] is an integer.
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<section class="usage">
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## Usage
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```javascript
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var isInteger = require( '@stdlib/math/base/assert/is-integer' );
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```
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#### isInteger( x )
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Tests if a finite [double-precision floating-point number][ieee754] is an `integer`.
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```javascript
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var bool = isInteger( 1.0 );
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// returns true
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```
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</section>
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<!-- /.usage -->
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<section class="notes">
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## Notes
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- The function assumes a **finite** `number`. If provided positive or negative `infinity`, the function will return `true`, when, in fact, the result is undefined. If `x` can be `infinite`, wrap the implementation as follows:
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```javascript
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function check( x ) {
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return (
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x < Infinity &&
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x > -Infinity &&
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isInteger( x )
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);
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}
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var bool = check( Infinity );
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// returns false
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bool = check( -Infinity );
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// returns false
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```
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</section>
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<!-- /.notes -->
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<section class="examples">
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## Examples
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<!-- eslint no-undef: "error" -->
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```javascript
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var isInteger = require( '@stdlib/math/base/assert/is-integer' );
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var bool = isInteger( -5.0 );
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// returns true
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bool = isInteger( 3.14 );
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// returns false
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bool = isInteger( NaN );
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// returns false
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```
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</section>
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<!-- /.examples -->
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<section class="links">
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[ieee754]: https://en.wikipedia.org/wiki/IEEE_754-1985
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</section>
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<!-- /.links -->
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