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I have a variable id and I want to use it as a key in a hash so that the value assigned to the variable is used as key of the hash.
For instance, if I have the variable id = 1 the desired resulting hash would be { 1: 'foo' }.
I've tried creating the hash with,
{ id: 'foo' } But that doesn't work, instead resulting in a hash with the symbol :id to 'foo'.
I could have sworn I've done this before but I am completely drawing a blank.
766
Short answer is no, hashes need to have unique keys.
Ruby hash creation. A hash can be created in two basic ways: with the new keyword or with the hash literal. The first script creates a hash and adds two key-value pairs into the hash object. A hash object is created.
Hash literals use the curly braces instead of square brackets and the key value pairs are joined by =>. For example, a hash with a single key/value pair of Bob/84 would look like this: { "Bob" => 84 }. Additional key/value pairs can be added to the hash literal by separating them with commas.
Each key can only have one value. But the same value can occur more than once inside a Hash, while each key can occur only once.
If you want to populate a new hash with certain values, you can pass them to Hash::[]:
Hash["a", 100, "b", 200] #=> {"a"=>100, "b"=>200} Hash[ [ ["a", 100], ["b", 200] ] ] #=> {"a"=>100, "b"=>200} Hash["a" => 100, "b" => 200] #=> {"a"=>100, "b"=>200} So in your case:
Hash[id, 'foo'] Hash[[[id, 'foo']]] Hash[id => 'foo'] The last syntax id => 'foo' can also be used with {}:
{ id => 'foo' } Otherwise, if the hash already exists, use Hash#=[]:
h = {} h[id] = 'foo' If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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