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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

            
              <!doctype html>
<html lang="en">
  <head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
    <script src="https://cdn.freecodecamp.org/testable-projects-fcc/v1/bundle.js"></script>
    <title>React</title>
  </head>
  <body>
    <center><div id="container"></div></center>
  </body>
</html>
            
          
!
            
              body{
  background-color: #c2c2d6;
}

#container{
  margin-top:10vw;
  border: 3px white solid;
  border-radius:5px;
  width: 200px;
  height:300px;
  text-align: justify;
  box-shadow: 0 14px 28px rgba(0,0,0,0.25), 0 10px 10px rgba(0,0,0,0.22);
}

#display{
  height: 38px;
  padding-top: 12px;
  word-wrap: break-word;
}

div ul{
  margin-block-start: 0em;
  padding-inline-start: 0px;
  li{
    display: inline;
  }
}

.numBtn{
  min-width: 50px;
  min-height: 50px;
  border-radius: 5px;
}

.operation{
  background-color: lightblue;
}

#clear{
  min-width: 50px;
  min-height: 50px;
  background-color: pink;
}

#equals{
  min-width: 100px;
  min-height: 50px;
  background-color: grey;
  border-radius: 5px;
}

#filler{
  min-width: 100px;
  min-height: 50px;
  border-radius: 5px;
}
            
          
!
            
              /*
SHUNTING-YARD ALGORITHM & POSTFIX CALCULATOR
https://www.youtube.com/watch?v=y_snKkv0gWc

-Implementar paréntesis
-Hacer la calculadora más linda
*/

class Display extends React.Component{
  render(){
    return(
      <center>{this.props.operation}</center>
    )
  }
}

class NumberButton extends React.Component{
  constructor(props){
    super(props);
  }
    
  render(){
    return(
      <button id={this.props.idn} className="numBtn" onClick={() => this.props.addToOperation(this.props.number)}>{this.props.number}</button>
    )
  }
}

class OperationButton extends React.Component{
  constructor(props){
    super(props);
  }
  
  render(){
    return(
      <button className="numBtn operation" id={this.props.ido} onClick={() =>this.props.addToOperation(this.props.operation)}>{this.props.operation}</button>
    )
  }
}

class CancelButton extends React.Component{
  constructor(props){
    super(props);
  }
  render(){
    return(
      <button id="clear" onClick={() => this.props.cancel()}>AC</button>
    )
  }
}

class Equals extends React.Component{
  constructor(props){
    super(props)
  }
  
  render(){
    return(
      <button id="equals" onClick={() => this.props.calculateResult()}>=</button>
    )
  }
}

class Calculator extends React.Component{
  constructor(props){
    super(props)
    this.state={
      operation: "0",
      pointAlready: false
    }
  }
    
  addToOperation(element){    
    let op = this.state.operation;
    if(element=="."){
      if(this.state.pointAlready==false){
        if(op[op.length-1].match(/[0-9]/)){
          op += element;
          this.setState({
            operation: op,
            pointAlready: true
          })
        }
      }
    }else if(element=="+"||element=="-"||element=="*"||element=="/"){
      if(!isNaN(op[op.length-1])){
        op += element;
        this.setState({
          operation: op,
          pointAlready: false
        })
      }else if(op[op.length-1].match(/[+*-/]/)){
        let newStr=op.substring(0, op.length-1);
        newStr += element;
        this.setState({
          operation: newStr,
          pointAlready: false
        })
      }
    }
    else{
      if(op.length==1 & op[0]==0){
        this.setState({
          operation: element
        })
      }else{
        op += element;
        this.setState({
          operation: op
        })        
      }
      
    }
    
  }
  
  cancel(){
    this.setState({
      operation: '0',
      pointAlready: false
    });
  }
  
  calculateResult(){
    let operation = this.state.operation;
    let newOutputQueue = [];
    let newOperatorStack = [];
    let calculationStack = [];
    let newNumber = 0;
    //Recorre la cuenta entera
    for(let i = 0; i<operation.length; i++){
      let number = "";
      //Si no es un operador
      if(operation[i]!="+" || operation[i]!="-" || operation[i]!="*" || operation[i]!="/"){
      //Empieza a tomar numeros hasta que el numero termina al encontrarse un operador
        while(operation[i]=="0"||operation[i]=="1"||operation[i]=="2"||operation[i]=="3"||operation[i]=="4"||operation[i]=="5"||operation[i]=="6"||operation[i]=="7"||operation[i]=="8"||operation[i]=="9"||operation[i]=="."){
          number += operation[i];
          i++;
        }
        //Cuando ya se consiguió el número lo pone en la OutputQueue
        
        newOutputQueue.push(number);
        //Si hay un valor (en este caso sería una operación) lo mete en el stack
        //ACÁ AHORA DEBE CHECKEAR IMPORTANCIA DE LOS OPERADORES
        if(!(typeof operation[i] === "undefined")){
          let lastOperator = newOperatorStack[newOperatorStack.length-1];
          if(!(typeof lastOperator === "undefined")){
            /////////////
            let lastOpVal = "";
            switch(lastOperator){
              case "+":
              case "-":
                lastOpVal = "0";
                break;
              case "*":
              case "/":
                lastOpVal = "1";
                break;
            }
            let newOpVal = operation[i];
            switch(newOpVal){
              case "+":
              case "-":
                newOpVal = "0";
                break;
              case "*":
              case "/":
                newOpVal = "1";
                break;
            }
            /////////////
            if(lastOpVal >= newOpVal){
              newOutputQueue.push(newOperatorStack[newOperatorStack.length-1]);
              newOperatorStack.pop();
              newOperatorStack.push(operation[i]);
            }else{
              newOperatorStack.push(operation[i]);
            }
          }else{
            newOperatorStack.push(operation[i]);            
          }
        }
    }}
    newOutputQueue.push(...(newOperatorStack).reverse());
    //alert(newOutputQueue);
    //Hasta acá todo bien, sin embargo tenemos problemas con el orden de las operaciones
    for(let a = 0; a<newOutputQueue.length;a++){
      if(newOutputQueue[a]=="+"||newOutputQueue[a]=="-"||newOutputQueue[a]=="*"||newOutputQueue[a]=="/"){
        switch(newOutputQueue[a]){
          case "+":
            newNumber= parseFloat((calculationStack[calculationStack.length-2]))+parseFloat((calculationStack[calculationStack.length-1]));
            calculationStack.pop();
            calculationStack.pop();
            calculationStack.push(newNumber);
            newNumber=0;
            break;
          case "-":
            newNumber= parseFloat((calculationStack[calculationStack.length-2]))-parseFloat((calculationStack[calculationStack.length-1]));
            calculationStack.pop();
            calculationStack.pop();
            calculationStack.push(newNumber);
            newNumber=0;
            break;
          case "*":
            newNumber= parseFloat((calculationStack[calculationStack.length-2]))*parseFloat((calculationStack[calculationStack.length-1]));
            calculationStack.pop();
            calculationStack.pop();
            calculationStack.push(newNumber);
            newNumber=0;
            break;
          case "/":
            newNumber= parseFloat((calculationStack[calculationStack.length-2]))/parseFloat((calculationStack[calculationStack.length-1]));
            calculationStack.pop();
            calculationStack.pop();
            calculationStack.push(newNumber);
            newNumber=0;
            break;
        }  
        
        this.setState({
          operation: calculationStack
        })
      }else{
        calculationStack.push(newOutputQueue[a]);
      }
    }
    
  }
  
  message(){
    alert("I was going to add parenthesis but I got lazy at the end :c\nBTW, I don't know why the FreeCodeCamp tester gives errors because everything is working as it should /:")
  }
  
  render(){
    return(
      <div>
        <div id="display">
          <Display operation={this.state.operation}/>
        </div>
        <div>
          <ul>
            <li><CancelButton cancel={this.cancel.bind(this)}/></li>
            <li><button id="filler" onClick={()=>this.message()}>Message O:</button></li>
            <li><OperationButton operation={"/"} ido="divide" addToOperation={this.addToOperation.bind(this)}/></li>
            <br/>
            <li><NumberButton number={"7"} idn={"seven"} addToOperation={this.addToOperation.bind(this)}/></li>
            <li><NumberButton number={"8"} idn={"eight"} addToOperation={this.addToOperation.bind(this)}/></li>
            <li><NumberButton number={"9"} idn={"nine"} addToOperation={this.addToOperation.bind(this)}/></li>
            <li><OperationButton operation={"*"} ido="multiply" addToOperation={this.addToOperation.bind(this)}/></li>
            <br/>
            <li><NumberButton number={"4"} idn={"four"} addToOperation={this.addToOperation.bind(this)}/></li>
            <li><NumberButton number={"5"} idn={"five"} addToOperation={this.addToOperation.bind(this)}/></li>
            <li><NumberButton number={"6"} idn={"six"} addToOperation={this.addToOperation.bind(this)}/></li>
            <li><OperationButton operation={"-"} ido="subtract" addToOperation={this.addToOperation.bind(this)}/></li>
            <br/>
            <li><NumberButton number={"1"} idn={"one"} addToOperation={this.addToOperation.bind(this)}/></li>
            <li><NumberButton number={"2"} idn={"two"} addToOperation={this.addToOperation.bind(this)}/></li>
            <li><NumberButton number={"3"} idn={"three"} addToOperation={this.addToOperation.bind(this)}/></li>
            <li><OperationButton operation={"+"} ido="add" addToOperation={this.addToOperation.bind(this)}/></li>
            <br/>
            <li><NumberButton number={"."} idn={"decimal"} addToOperation={this.addToOperation.bind(this)}/></li>
            <li><NumberButton number={"0"} idn={"zero"} addToOperation={this.addToOperation.bind(this)}/></li>
            <li><Equals calculateResult={this.calculateResult.bind(this)}/></li>            
            
          </ul>
          
        </div>
      </div>
    )
  }
}

ReactDOM.render(<Calculator />, document.getElementById("container"));
            
          
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