diff --git a/snippets/toHash.md b/snippets/toHash.md index 32b5437af..9343c1e51 100644 --- a/snippets/toHash.md +++ b/snippets/toHash.md @@ -1,10 +1,12 @@ ### toHash -Reduces a given iterable type into a value hash(Object by reference) by the given property or the current iteration +Reduces a given Array Like into a value hash(keyed data store) + +Given an Iterable or Array like structure we call Array.prototype.reduce.call on the provided object to step over it and return an Object keyed by the reference value ```js const toHash = ( object, key ) => - object.reduce( ( acc, data, index ) => ( ( acc[ data[ key || index ] ] = data ), acc ), {} ) + Array.prototype.reduce.call( object, ( acc, data, index ) => ( ( acc[ !key ? index : data[ key ] ] = data ), acc ), {} ) ) ``` ```js @@ -14,7 +16,7 @@ toHash([ { a: 'label' } ], 'a'); // { label: { a: 'label' } } // A more in depth example let users = [ { id: 1, first: 'Jon' }, { id: 2, first: 'Joe' }, { id: 3, first: 'Moe' } ]; let managers = [ { manager: 1, employees: [ 2, 3 ] } ]; -// We use function here because we need a bindable reference +// We use function here because we want a bindable reference but a closure referencing the hash would work too managers.forEach( manager => manager.employees = manager.employees.map( function( id ){