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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>JS what?</title>
<script type="text/javascript">
let getContainers = function () {
return [...document.getElementsByClassName('container')].map(c => {
let prefix = c.querySelector('.prefix');
let expression = c.querySelector('.expression');
return ({
prefix: prefix ? prefix.innerText : '',
expression: expression ? expression.innerText : '',
element: c
});
});
};
function applyExpressions() {
const containers = getContainers();
const testedValue = document.getElementById('testedValue').value;
containers.forEach(({prefix, expression, element}) => {
setResult(element, compute("( "+prefix +" "+ testedValue +" "+ expression+" )"));
});
}
function compute(expression) {
try {
return eval(expression);
} catch (e) {
return '¯\\_(ツ)_/¯';
}
}
function setResult(element, value) {
let css = 'none';
if (value===true) {
css = 'yes';
} else if (value===false) {
css = 'no';
}
element.querySelector('span:last-child').className = css;
}
function magic(event) {
event.preventDefault();
applyExpressions();
}
</script>
<style type="text/css">
body {
font-family: monospace;
}
.container {
width: 50%;
display: flex;
}
.container span, .container input {
width: 50%;
height: 38px;
padding: 10px;
margin: 4px;
}
.container span:last-child {
width: 60px;
flex-shrink: 0;
}
form input {
padding: 10px;
margin: 4px;
}
form div {
margin: auto;
width: 50%;
padding: auto;
align-content: center;
alignment: center;
text-align: center;
}
.results {
display: flex;
flex-wrap: wrap
}
.yes,.no,.none {
background-repeat: no-repeat;
}
.yes {
background-image: url('assets/yes.png');
}
.no {
background-image: url('assets/no.png');
}
.none {
background-image: url('assets/none.png');
}
.h {
color: red;
font-weight: bold;
}
</style>
</head>
<body>
<div style="width:800px;top:200px;margin: auto;">
<form onsubmit="return false;">
<div>
Is... <input type="text"
id="testedValue"
onchange="magic(event)">
</div>
</form>
<hr>
<div style="margin: 0 190px;">
Remember: operator <span class="h">==</span> is symmetric (if <span class="h">A == B</span> then <span class="h">B == A</span>)
<br>
but not transitive (<span class="h">A == B</span> and <span class="h">B == C</span> do <b>not</b> imply <span class="h">A == C</span>)
</div>
<hr>
<div class="results">
<div class="container"><span class="prefix">!!(</span><span>..</span><span class="expression">)</span> <span>? [if(...)]</span> <span class="placeholder"> </span> </div>
<div class="container"><span class="prefix">!(</span><span>..</span><span class="expression">)</span> <span>? [if(!...)]</span> <span class="placeholder"> </span> </div>
<div class="container"><span class="expression">== null</span> <span>?</span> <span class="placeholder"> </span> </div>
<div class="container"><span class="expression">=== null</span> <span>?</span> <span class="placeholder"> </span> </div>
<div class="container"><span class="expression">== undefined</span> <span>?</span> <span class="placeholder"> </span> </div>
<div class="container"><span class="expression">=== undefined</span> <span>?</span> <span class="placeholder"> </span> </div>
<div class="container"><span class="expression">== 0</span> <span>?</span> <span class="placeholder"> </span> </div>
<div class="container"><span class="expression">=== 0</span> <span>?</span> <span class="placeholder"> </span> </div>
<div class="container"><span class="expression">== '0'</span> <span>?</span> <span class="placeholder"> </span> </div>
<div class="container"><span class="expression">=== '0'</span> <span>?</span> <span class="placeholder"> </span> </div>
<div class="container"><span class="expression">== ''</span> <span>?</span> <span class="placeholder"> </span> </div>
<div class="container"><span class="expression">=== ''</span> <span>?</span> <span class="placeholder"> </span> </div>
<div class="container"><span class="expression">== []</span> <span>?</span> <span class="placeholder"> </span> </div>
<div class="container"><span class="expression">=== []</span> <span>?</span> <span class="placeholder"> </span> </div>
<div class="container"><span class="expression">== {}</span> <span>?</span> <span class="placeholder"> </span> </div>
<div class="container"><span class="expression">=== {}</span> <span>?</span> <span class="placeholder"> </span> </div>
<div class="container"><span class="expression">== NaN</span> <span>?</span> <span class="placeholder"> </span> </div>
<div class="container"><span class="expression">=== NaN</span> <span>?</span> <span class="placeholder"> </span> </div>
<div class="container"><span class="expression">== true</span> <span>?</span> <span class="placeholder"> </span> </div>
<div class="container"><span class="expression">=== true</span> <span>?</span> <span class="placeholder"> </span> </div>
<div class="container"><span class="expression">== false</span> <span>?</span> <span class="placeholder"> </span> </div>
<div class="container"><span class="expression">=== false</span> <span>?</span> <span class="placeholder"> </span> </div>
</div>
</div>
</body>
</html>