FreeCodeCamp/HelpFrontEnd

Get help on our Front End Development projects.

Markus Kiili

@Masd925

@sfshameem5 You could make an expression parser that evaluates the typed expression.

shameem fairooz

@sfshameem5

@Masd925 A function which does that ?

Markus Kiili

@Masd925

@sfshameem5 Yes.

shameem fairooz

@sfshameem5

@Masd925 Is it bad to use eval() for calculations ?

hansUno2

@hansUno2

Yes.. Even the docs say to never use it

Markus Kiili

@Masd925

@sfshameem5 Using eval is bad for security and performance reasons, so you should avoid it.

shameem fairooz

@sfshameem5

@Masd925 Will modify and let you know.

Markus Kiili

@Masd925

@sfshameem5 There are known algorithms for parsing expressions, but you can also do your own by making the expression simpler and simpler starting from the highest priority operations etc.

shameem fairooz

@sfshameem5

@Masd925 Which one would you recommend ?

Markus Kiili

@Masd925

@sfshameem5 Whatever suits you.

Jefferson

@jeffersonnnn

@hansUno2 thanks man, but i am not looking for an API for quotes. I am looking to share the quotes, and i haven't been able to get the method

CamperBot

@camperbot

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shameem fairooz

@sfshameem5

@Masd925 Will try the second option.

hansUno2

@hansUno2

@jeffersonnnn to post it on twitter?

Jefferson

@jeffersonnnn

@hansUno2 yes yes

shameem fairooz

@sfshameem5

@jeffersonnnn https://dev.twitter.com/web/tweet-button

hansUno2

@hansUno2

@jeffersonnnn you have to read the directions on the twitter page, no API needed

Jefferson

@jeffersonnnn

@sfshameem5 thanks man. i appreciate

CamperBot

@camperbot

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hansUno2

@hansUno2

@sfshameem5 how are you calculating you expression with your calc app?

I tried it but could no get an answer

Jefferson

@jeffersonnnn

@hansUno2 could you show me directions to this page?

shameem fairooz

@sfshameem5

@hansUno2 Used eval() but it ain't recommended. Might have to create a function to validate expressions

hansUno2

@hansUno2

@jeffersonnnn

Jefferson

@jeffersonnnn

@hansUno2 so i went to the link and i am going through the javascript api end. The problem however is that i am building my app in React, not pure js

hansUno2

@hansUno2

@jeffersonnnn read this section--> "How to add a Tweet button to your websit". the link posted by @sfshameem5

@jeffersonnnn not sure how you would do it with react

@sfshameem5 are the numbers being displayed in an input element?

Javier Pons

@JavierPons

Hi there!

<html>
  <h1>Type a number between 1 - 10</h1>
  <form action="" name="form1">
    <input type="text" name="text" width="20px">
    <button onClick="init()">Press</button>
  </form>

</html>

var numb = Math.floor(Math.random() * 10 +1);

function init() {
  var inicio = document.form1.text.value;
  console.log("coge");
}

function check() {
  var count = 0;
  var acept = init();


   if(acept == numb) {
     showWin();
     count++;
   } else if( acept !== numb) {
             showError();
     count++;
   } else if((acept !== numb) && (count == 5 )) {
     showLoss();
     count++;
   }

}

function showWin() {
  console.log("gano!");
}

function showError() {
  console.log("perdio");
}

function showLoss() {

  console.log("mas de cinco veces, perdio");
}

hansUno2

@hansUno2

shameem fairooz

@sfshameem5

@hansUno2 A <div> element

Javier Pons

@JavierPons

is it function init() taking the value of the input?

some vision, if you can ...

hansUno2

@hansUno2

Claudio Restifo

@Marmiz

@JavierPons it's onclick in vanilla JS, onClick is general for react, vue and the other frameworks

hansUno2

@hansUno2

Document.form1.text is not defined as far as i can see

Javier Pons

@JavierPons

ok!

Claudio Restifo

@Marmiz

@JavierPons then to get the input value it's probably way easier to use getElementByID().value

Javier Pons

@JavierPons

you are right!

hansUno2

@hansUno2

@JavierPons yes. Or querySelector

You have to specify the elemen name , class, or id

Javier Pons

@JavierPons

:+1:

Javier Pons

@JavierPons

@Marmiz @hansUno2 thanks!

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@camperbot

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Sundeep

@pidugusundeep

@camperbot thanks

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