summaryrefslogtreecommitdiff
path: root/deps/npm/node_modules/lodash/internal/baseUniq.js
diff options
context:
space:
mode:
Diffstat (limited to 'deps/npm/node_modules/lodash/internal/baseUniq.js')
-rw-r--r--deps/npm/node_modules/lodash/internal/baseUniq.js60
1 files changed, 60 insertions, 0 deletions
diff --git a/deps/npm/node_modules/lodash/internal/baseUniq.js b/deps/npm/node_modules/lodash/internal/baseUniq.js
new file mode 100644
index 0000000000..a043443f2e
--- /dev/null
+++ b/deps/npm/node_modules/lodash/internal/baseUniq.js
@@ -0,0 +1,60 @@
+var baseIndexOf = require('./baseIndexOf'),
+ cacheIndexOf = require('./cacheIndexOf'),
+ createCache = require('./createCache');
+
+/** Used as the size to enable large array optimizations. */
+var LARGE_ARRAY_SIZE = 200;
+
+/**
+ * The base implementation of `_.uniq` without support for callback shorthands
+ * and `this` binding.
+ *
+ * @private
+ * @param {Array} array The array to inspect.
+ * @param {Function} [iteratee] The function invoked per iteration.
+ * @returns {Array} Returns the new duplicate free array.
+ */
+function baseUniq(array, iteratee) {
+ var index = -1,
+ indexOf = baseIndexOf,
+ length = array.length,
+ isCommon = true,
+ isLarge = isCommon && length >= LARGE_ARRAY_SIZE,
+ seen = isLarge ? createCache() : null,
+ result = [];
+
+ if (seen) {
+ indexOf = cacheIndexOf;
+ isCommon = false;
+ } else {
+ isLarge = false;
+ seen = iteratee ? [] : result;
+ }
+ outer:
+ while (++index < length) {
+ var value = array[index],
+ computed = iteratee ? iteratee(value, index, array) : value;
+
+ if (isCommon && value === value) {
+ var seenIndex = seen.length;
+ while (seenIndex--) {
+ if (seen[seenIndex] === computed) {
+ continue outer;
+ }
+ }
+ if (iteratee) {
+ seen.push(computed);
+ }
+ result.push(value);
+ }
+ else if (indexOf(seen, computed, 0) < 0) {
+ if (iteratee || isLarge) {
+ seen.push(computed);
+ }
+ result.push(value);
+ }
+ }
+ return result;
+}
+
+module.exports = baseUniq;