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$by_key = $books->keyBy('title');
$by_key->all();

//result

/*

[
    'Lean Startup' => ['title' => 'Lean Startup', 'price' => 10],
    'The One Thing' => ['title' => 'The One Thing', 'price' => 15],
    'Laravel: Code Bright' => ['title' => 'Laravel: Code Bright', 'price' => 20],
    'The 4-Hour Work Week' => ['title' => 'The 4-Hour Work Week', 'price' => 5],
]

*/