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reference/unique_names.md

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+# Make unique variable names
+
+Helper function to create new variable names that are unique given a set
+of existing names (in a data set, for example). If a variable name
+already exists, a number will be appended.
+
+## Usage
+
+``` r
+unique_names(new, existing = character())
+```
+
+## Arguments
+
+- new:
+
+  a vector of proposed new variable names
+
+- existing:
+
+  a vector of existing variable names
+
+## Value
+
+a vector of unique new variable names
+
+## Examples
+
+``` r
+unique_names(c("var_x", "var_y", "var_x"), c("var_x", "var_z"))
+#> [1] "var_x_1" "var_y"   "var_x_2"
+```