truncate의 사전적 의미
1. 끝을 자르다. 2. 꼭대기를 자르다. 3. 일부를 생략하여 줄이다. 4.끝수를 버리다.
─ 출처 : 다음 영어사전
[ Javascript ] Math.trunc()
Math.trunc() 함수는 소수점 이하를 전부 삭제한다.
The Math.trunc() function truncates all of the decimal places, and returns the integer part.
Polyfill
<script type="text/javascript">
/*
* source : https://tonks.tistory.com/162#_javascript_trunc
*/
Math.trunc = Math.trunc || function ( number ) { return Math[ number > 0 ? "floor" : "ceil" ]( number ); }
</script>
또는 (Another way is below.)
<script type="text/javascript">
/*
* source : https://tonks.tistory.com/162#_javascript_trunc
*/
if ( ! Math.trunc ){
Math.trunc = function ( value ) {
var number = Number( value );
return Math.abs( number ) === Infinity ? number : number - (number % 1);
};
}
</script>
둘 중 어느 것이 더 실용적인지를 묻는다면,,, I don't know... (─.─ ;;)
I don't know whether any way is the more practical. (─.─ ;;)
<button onclick="testing1()"> Click me </button>
<p id="demo1"></p>
<script type="text/javascript">
function testing1 (){
var num = 234.56;
demo1.innerHTML = Math.trunc( num );
}
</script>
<button onclick="testing2()"> Click me </button>
<p id="demo2"></p>
<script type="text/javascript">
function testing2 (){
var str = "234.56";
demo2.innerHTML = Math.trunc( str );
}
</script>
<button onclick="testing1()"> Click me </button>
<p id="demo1"></p>
<script type="text/javascript">
function testing1 (){
var num = -234.56;
demo1.innerHTML = Math.trunc( num );
}
</script>
<button onclick="testing2()"> Click me </button>
<p id="demo2"></p>
<script type="text/javascript">
function testing2 (){
var str = "-234.56";
demo2.innerHTML = Math.trunc( str );
}
</script>
<button onclick="testing1()"> Click me </button>
<p id="demo1"></p>
<script type="text/javascript">
function testing1 (){
var str = "23 456";
demo1.innerHTML = Math.trunc( str );
}
</script>
<button onclick="testing2()"> Click me </button>
<p id="demo2"></p>
<script type="text/javascript">
function testing2 (){
var str = "23,456";
demo2.innerHTML = Math.trunc( str );
}
</script>
<button onclick="testing1()"> Click me </button>
<p id="demo1"></p>
<script type="text/javascript">
function testing1 (){
var str = "034";
demo1.innerHTML = Math.trunc( str );
}
</script>
<button onclick="testing2()"> Click me </button>
<p id="demo2"></p>
<script type="text/javascript">
function testing2 (){
var str = "";
demo2.innerHTML = Math.trunc( str );
}
</script>
<button onclick="testing1()"> Click me </button>
<p id="demo1"></p>
<script type="text/javascript">
function testing1 (){
var x = null;
demo1.innerHTML = Math.trunc( x );
}
</script>
<button onclick="testing2()"> Click me </button>
<p id="demo2"></p>
<script type="text/javascript">
function testing2 (){
var x = undefined;
demo2.innerHTML = Math.trunc( x );
}
</script>
<button onclick="testing1()"> Click me </button>
<p id="demo1"></p>
<script type="text/javascript">
function testing1 (){
var num = Infinity;
demo1.innerHTML = Math.trunc( num );
}
</script>
<button onclick="testing2()"> Click me </button>
<p id="demo2"></p>
<script type="text/javascript">
function testing2 (){
var num = NaN;
demo2.innerHTML = Math.trunc( num );
}
</script>
<button onclick="testing1()"> Click me </button>
<p id="demo1"></p>
<script type="text/javascript">
function testing1 (){
var boolean = true;
demo1.innerHTML = Math.trunc( boolean );
}
</script>
<button onclick="testing2()"> Click me </button>
<p id="demo2"></p>
<script type="text/javascript">
function testing2 (){
var boolean = false;
demo2.innerHTML = Math.trunc( boolean );
}
</script>
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