49 lines
2.0 KiB
JavaScript
49 lines
2.0 KiB
JavaScript
//break up each string by '$'. The assumption is that the user wants the trailing $.
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var data = [
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"Given$a$text$file$of$many$lines,$where$fields$within$a$line$",
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"are$delineated$by$a$single$'dollar'$character,$write$a$program",
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"that$aligns$each$column$of$fields$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$justified,$or$center$justified$within$its$column."
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].map(function (str) { return str.split('$'); })
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//boilerplate: get longest array or string in array
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var getLongest = function (arr) {
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return arr.reduce(function (acc, item) { return acc.length > item.length ? acc : item; }, 0);
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};
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//boilerplate: this function would normally be in a library like underscore, lodash, or ramda
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var zip = function (items, toInsert) {
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toInsert = (toInsert === undefined) ? null : toInsert;
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var longestItem = getLongest(items);
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return longestItem.map(function (_unused, index) {
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return items.map(function (item) {
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return item[index] === undefined ? toInsert : item[index];
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});
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});
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};
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//here's the part that's not boilerplate
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var makeColumns = function (formatting, data) {
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var zipData = zip(data, '');
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var makeSpaces = function (num) { return new Array(num + 1).join(' '); };
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var formattedCols = zipData.map(function (column) {
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var maxLen = getLongest(column).length;//find the maximum word length
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if (formatting === 'left') {
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return column.map(function (word) { return word + makeSpaces(maxLen - word.length); });
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} else if (formatting === 'right') {
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return column.map(function (word) { return makeSpaces(maxLen - word.length) + word; });
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} else {
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return column.map(function (word) {
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var spaces = maxLen - word.length,
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first = ~~(spaces / 2),
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last = spaces - first;
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return makeSpaces(first) + word + makeSpaces(last);
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});
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}
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});
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return zip(formattedCols).map(function (row) { return row.join(' '); }).join('\n');
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};
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