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Created December 10, 2020 15:01
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data-advanced.md

Gandalf Good Gray Saruman Bad White Radagast Awesome Green Alatar Who? Blue

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data-basic.md

Gandalf - Good Saruman - Bad Radagast - Awesome Alatar - Who?

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sorter-app.html
<!DOCTYPE html>
<html>
<head>
<title>Sorter</title>
<style type="text/css">
body {
margin: 0 auto;
max-width: 40em;
width: 88%;
}
/**
* Form Styles
*/
form,
textarea {
margin-bottom: 1em;
}
label,
textarea {
display: block;
width: 100%;
}
label {
font-weight: bold;
}
textarea {
min-height: 12em;
}
#sorted {
white-space: pre-wrap;
}
</style>
</head>
<body>
<h1>Sorter App</h1>
<form id="sorter">
<label for="sort">Stuff to Sort</label>
<textarea id="sort"></textarea>
<button>Sort My Stuff</button>
</form>
<div id="sorted" aria-live="polite"></div>
<script>
// Variables
var sorter = document.querySelector('#sorter');
var sort = document.querySelector('#sort');
var sorted = document.querySelector('#sorted');
/**
* Handle form submissions
* @param {Event} event The event object
*/
var submitHandler = function (event) {
// Stop the form from submitting
event.preventDefault();
// Convert items to an array
var items = sort.value.split('\n');
// Sort alphabetically
items.sort();
// Update the UI
sorted.textContent = items.join('\n');
};
// Listen for form submissions
sorter.addEventListener('submit', submitHandler);
</script>
</body>
</html>
Raw
unfinished-advanced-sorter.html
<!DOCTYPE html>
<html>
<head>
<title>Sorter</title>
<style type="text/css">
body {
margin: 0 auto;
max-width: 40em;
width: 88%;
}
/**
* Form Styles
*/
form,
textarea,
input {
margin-bottom: 1em;
}
label,
textarea,
input {
display: block;
width: 100%;
}
label {
font-weight: bold;
}
textarea {
min-height: 12em;
}
#sorted {
white-space: pre-wrap;
}
</style>
</head>
<body>
<h1>Sorter App</h1>
<form id="sorter">
<label for="sort">Stuff to Sort</label>
<textarea id="sort"></textarea>
<label for="remove">Lines to Remove (comma separated)</label>
<input type="tel" id="remove">
<button>Sort My Stuff</button>
</form>
<div id="sorted" aria-live="polite"></div>
<script>
// Variables
var sorter = document.querySelector('#sorter');
var sort = document.querySelector('#sort');
var sorted = document.querySelector('#sorted');
var remove = document.querySelector('#remove');
/**
* If items should be removed, remove them
* @param {Array} items The items to sort
* @return {Array} The items with lines removed
*/
var removeItems = function (items) {
// If nothing should be removed, return as-is
if (!remove.value.length) return item;
// Get the lines to remove
// ex. [2, 3]
var lines = remove.value.split(',').map(function (num) {
return parseInt(num.trim(), 10) - 1;
});
// Create a new array, with lines removed
return items.filter(function (item, index) {
// Skip the first item
// if (index === 0) return true;
// Check if line should be removed
var removeIt = lines.filter(function (line) {
return line % index === 0;
}).length;
console.log(item, (index), !!removeIt);
// If line should be removed, exclude it
// Otherwise, keep it in the array
return removeIt ? false : true;
});
};
/**
* Handle form submissions
* @param {Event} event The event object
*/
var submitHandler = function (event) {
// Stop the form from submitting
event.preventDefault();
// Convert items to an array
var items = sort.value.split('\n');
items = removeItems(items);
// Sort alphabetically
items.sort();
// Update the UI
sorted.textContent = items.join('\n');
};
// Listen for form submissions
sorter.addEventListener('submit', submitHandler);
</script>
</body>
</html>
@svivian
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svivian commented Dec 13, 2020

I don't want to match exactly line 2, line 3, etc. I want to match every second or every third line, which is a bit different.

I was aware of that, and technically my solution does that. But removing "every second line" would remove lines 2, 4, 6 and so on. What you actually want is to remove every third line, but starting at line 2. And again starting at line 3. So SeizeDub is right about the missing 'group' parameter. This code works:

// Create a new array, with lines removed
return items.filter(function (item, index) {

	for (var i = 0; i < lines.length; i++) {
		// Check if line should be removed
		if (index % 3 === (lines[i] - 1))
			return false;
	}

	// If we got here, line should not be removed
	return true;
	
});

The 3 in index % 3 would need to be replaced by another input box.

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