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Frequency Counting

6 min · Rust examples

Use a dictionary to count how many times each value appears.

Examples in:PythonJavaScriptTypeScriptJavaC++CC#KotlinGoOCamlRubyPHPDartElixirRustScalaSwift
Rust · Frequency Counting0/5 cleared

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Many problems boil down to "how often does each thing show up?" A HashMap is perfect: keys are the items, values are counts.

Increment with *counts.entry(x).or_insert(0) += 1 as you scan the input once.

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