| 1 | /**
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| 2 | * This class allows a large text string to be constructed incrementally by appending small chunks. The final
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| 3 | * string can be obtained by calling StringBuilder.toString().
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| 4 | *
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| 5 | * @remarks
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| 6 | * A naive approach might use the `+=` operator to append strings: This would have the downside of copying
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| 7 | * the entire string each time a chunk is appended, resulting in `O(n^2)` bytes of memory being allocated
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| 8 | * (and later freed by the garbage collector), and many of the allocations could be very large objects.
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| 9 | * StringBuilder avoids this overhead by accumulating the chunks in an array, and efficiently joining them
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| 10 | * when `getText()` is finally called.
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| 11 | */
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| 12 | var StringBuilder = /** @class */ (function () {
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| 13 | function StringBuilder() {
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| 14 | this._chunks = [];
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| 15 | }
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| 16 | /** {@inheritdoc IStringBuilder.append} */
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| 17 | StringBuilder.prototype.append = function (text) {
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| 18 | this._chunks.push(text);
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| 19 | };
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| 20 | /** {@inheritdoc IStringBuilder.toString} */
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| 21 | StringBuilder.prototype.toString = function () {
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| 22 | if (this._chunks.length === 0) {
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| 23 | return '';
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| 24 | }
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| 25 | if (this._chunks.length > 1) {
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| 26 | var joined = this._chunks.join('');
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| 27 | this._chunks.length = 1;
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| 28 | this._chunks[0] = joined;
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| 29 | }
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| 30 | return this._chunks[0];
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| 31 | };
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| 32 | return StringBuilder;
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| 33 | }());
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| 34 | export { StringBuilder };
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| 35 | //# sourceMappingURL=StringBuilder.js.map |
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