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120 lines
2.6 KiB
Markdown
120 lines
2.6 KiB
Markdown
---
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id: 69a890af247de743333bd4d2
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title: "Challenge 229: Truncate the Text 2"
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challengeType: 28
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dashedName: challenge-229
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---
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# --description--
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Given a string, return a new string that is truncated so that the total width of the characters does not exceed 50 units.
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Each character has a specific width:
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| Letters | Width |
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| - | - |
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| `"ilI"` | 1 |
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| `"fjrt"` | 2 |
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| `"abcdeghkmnopqrstuvwxyzJL"` | 3 |
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| `"ABCDEFGHKMNOPQRSTUVWXYZ"` | 4 |
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The table above includes all upper and lower case letters. Additionally:
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- Spaces (`" "`) have a width of 2
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- Periods (`"."`) have a width of 1
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- If the given string is 50 units or less, return the string as-is, otherwise
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- Truncate the string and add three periods at the end (`"..."`) so its total width, including the three periods, is as close as possible to 50 units without going over.
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# --hints--
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`truncateText("The quick brown fox")` should return `"The quick brown f..."`.
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```js
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assert.equal(truncateText("The quick brown fox"), "The quick brown f...");
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```
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`truncateText("The silky smooth sloth")` should return `"The silky smooth s..."`.
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```js
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assert.equal(truncateText("The silky smooth sloth"), "The silky smooth s...");
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```
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`truncateText("THE LOUD BRIGHT BIRD")` should return `"THE LOUD BRIG..."`.
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```js
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assert.equal(truncateText("THE LOUD BRIGHT BIRD"), "THE LOUD BRIG...");
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```
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`truncateText("The fast striped zebra")` should return `"The fast striped z..."`.
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```js
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assert.equal(truncateText("The fast striped zebra"), "The fast striped z...");
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```
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`truncateText("The big black bear")` should return `"The big black bear"`.
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```js
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assert.equal(truncateText("The big black bear"), "The big black bear");
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```
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# --seed--
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## --seed-contents--
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```js
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function truncateText(str) {
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return str;
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}
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```
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# --solutions--
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```js
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function truncateText(str) {
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const MAX_WIDTH = 50;
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const ELLIPSIS = "...";
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const ELLIPSIS_WIDTH = 3;
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const TRUNCATE_LIMIT = MAX_WIDTH - ELLIPSIS_WIDTH;
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const charGroups = {
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'ilI.': 1,
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'fjrt ': 2,
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'abcdeghkmnopqrstuvwxyzJL': 3,
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'ABCDEFGHKMNOPQRSTUVWXYZ': 4
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};
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function getCharWidth(char) {
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for (const key in charGroups) {
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if (key.includes(char)) return charGroups[key];
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}
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return 3;
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}
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function stringWidth(str) {
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let totalWidth = 0;
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for (const char of str) {
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totalWidth += getCharWidth(char);
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}
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return totalWidth;
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}
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if (stringWidth(str) <= MAX_WIDTH) return str;
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let result = "";
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let totalWidth = 0;
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for (const char of str) {
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const charWidth = getCharWidth(char);
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if (totalWidth + charWidth > TRUNCATE_LIMIT) break;
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result += char;
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totalWidth += charWidth;
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}
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return result + ELLIPSIS;
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}
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```
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