195 lines
6.5 KiB
Markdown
195 lines
6.5 KiB
Markdown
---
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id: 594810f028c0303b75339ad0
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title: Align columns
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challengeType: 5
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forumTopicId: 302224
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dashedName: align-columns
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---
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# --description--
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Given a text file of many lines, where fields within a line are delineated by a single `$` character, write a program that aligns each column of fields by ensuring that words in each column are separated by at least one space. Further, allow for each word in a column to be either left justified, right justified, or center justified within its column.
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# --instructions--
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Use the following text to test your programs:
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<pre>
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Given$a$text$file$of$many$lines
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where$fields$within$a$line$
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are$delineated$by$a$single$'dollar'$character
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write$a$program
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that$aligns$each$column$of$fields
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by$ensuring$that$words$in$each$
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column$are$separated$by$at$least$one$space.
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Further,$allow$for$each$word$in$a$column$to$be$either$left$
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justified,$right$justified
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or$center$justified$within$its$column.
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</pre>
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**Note that:**
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<ul>
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<li>The example input texts lines may, or may not, have trailing dollar characters.</li>
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<li>All columns should share the same alignment.</li>
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<li>Consecutive space characters produced adjacent to the end of lines are insignificant for the purposes of the task.</li>
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<li>Output text will be viewed in a mono-spaced font on a plain text editor or basic terminal.</li>
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<li>The minimum space between columns should be computed from the text and not hard-coded.</li>
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<li>It is not a requirement to add separating characters between or around columns.</li>
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</ul>
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# --hints--
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`formatText` should be a function.
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```js
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assert(typeof formatText === 'function');
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```
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`formatText` with the above input and "right" justification should produce the following:
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```js
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assert.strictEqual(formatText(testInput, 'right'), rightAligned);
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```
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`formatText` with the above input and "left" justification should produce the following:
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```js
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assert.strictEqual(formatText(testInput, 'left'), leftAligned);
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```
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`formatText` with the above input and "center" justification should produce the following:
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```js
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assert.strictEqual(formatText(testInput, 'center'), centerAligned);
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```
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# --seed--
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## --after-user-code--
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```js
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const testInput = [
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'Given$a$text$file$of$many$lines',
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'where$fields$within$a$line$',
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'are$delineated$by$a$single$\"dollar\"$character',
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'write$a$program',
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'that$aligns$each$column$of$fields$',
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'by$ensuring$that$words$in$each$',
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'column$are$separated$by$at$least$one$space.',
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'Further,$allow$for$each$word$in$a$column$to$be$either$left$',
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'justified,$right$justified',
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'or$center$justified$within$its$column.'
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];
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const rightAligned = ' Given a text file of many lines\n' +
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' where fields within a line \n' +
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' are delineated by a single "dollar" character\n' +
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' write a program\n' +
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' that aligns each column of fields \n' +
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' by ensuring that words in each \n' +
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' column are separated by at least one space.\n' +
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' Further, allow for each word in a column to be either left \n' +
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'justified, right justified\n' +
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' or center justified within its column.';
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const leftAligned = 'Given a text file of many lines \n' +
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'where fields within a line \n' +
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'are delineated by a single "dollar" character\n' +
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'write a program \n' +
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'that aligns each column of fields \n' +
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'by ensuring that words in each \n' +
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'column are separated by at least one space.\n' +
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'Further, allow for each word in a column to be either left \n' +
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'justified, right justified\n' +
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'or center justified within its column. ';
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const centerAligned = ' Given a text file of many lines \n' +
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' where fields within a line \n' +
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' are delineated by a single \"dollar\" character\n' +
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' write a program \n' +
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' that aligns each column of fields \n' +
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' by ensuring that words in each \n' +
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' column are separated by at least one space.\n' +
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' Further, allow for each word in a column to be either left \n' +
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'justified, right justified\n' +
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' or center justified within its column. ';
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```
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## --seed-contents--
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```js
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const testArr = [
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'Given$a$text$file$of$many$lines',
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'where$fields$within$a$line$',
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'are$delineated$by$a$single$"dollar"$character',
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'write$a$program',
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'that$aligns$each$column$of$fields$',
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'by$ensuring$that$words$in$each$',
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'column$are$separated$by$at$least$one$space.',
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'Further,$allow$for$each$word$in$a$column$to$be$either$left$',
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'justified,$right$justified',
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'or$center$justified$within$its$column.'
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];
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function formatText(input, justification) {
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}
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```
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# --solutions--
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```js
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const testArr = [
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'Given$a$text$file$of$many$lines',
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'where$fields$within$a$line$',
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'are$delineated$by$a$single$"dollar"$character',
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'write$a$program',
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'that$aligns$each$column$of$fields$',
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'by$ensuring$that$words$in$each$',
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'column$are$separated$by$at$least$one$space.',
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'Further,$allow$for$each$word$in$a$column$to$be$either$left$',
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'justified,$right$justified',
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'or$center$justified$within$its$column.'
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];
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String.prototype.repeat = function (n) { return new Array(1 + parseInt(n)).join(this); };
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function formatText(input, justification) {
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let x, y, max, cols = 0, diff, left, right;
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for (x = 0; x < input.length; x++) {
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input[x] = input[x].split('$');
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if (input[x].length > cols) {
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cols = input[x].length;
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}
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}
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for (x = 0; x < cols; x++) {
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max = 0;
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for (y = 0; y < input.length; y++) {
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if (input[y][x] && max < input[y][x].length) {
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max = input[y][x].length;
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}
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}
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for (y = 0; y < input.length; y++) {
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if (input[y][x]) {
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diff = (max - input[y][x].length) / 2;
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left = ' '.repeat(Math.floor(diff));
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right = ' '.repeat(Math.ceil(diff));
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if (justification === 'left') {
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right += left; left = '';
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}
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if (justification === 'right') {
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left += right; right = '';
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}
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input[y][x] = left + input[y][x] + right;
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}
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}
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}
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for (x = 0; x < input.length; x++) {
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input[x] = input[x].join(' ');
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}
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input = input.join('\n');
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return input;
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}
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```
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