Top Tweets for #learnruby
Ruby’s to_i is more forgiving than people expect. It converts leading numeric characters, then stops as soon as the string no longer looks like a number. And if the string does not start with a number at all, you just get 0.
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to_h converts an array of key/value pairs into a hash. If the same key shows up more than once, Ruby keeps the last value it sees, so later entries override earlier ones.
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Ruby’s then keeps a chain readable. It passes the previous result into the block, and returns whatever the block returns.
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Ruby’s values_at is a quick way to grab multiple values from a hash in one go. No extra indexing. Just the keys you want, in order.
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Need the smallest and biggest number fast? Ruby’s minmax returns both in one call.
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Ruby’s partition splits one array into two. The first array gets everything that matches your condition, while the second array gets the rest.
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Ruby shortcut: tally. It counts duplicates in an array and returns a hash of totals.
Great for quick “how many of each?” moments.
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Ruby ranges: use .. when you want to include the end value, and ... when you want to exclude it. In this snippet, a includes 3, while b does not.
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Freezing a nested array in Ruby only locks the outer array. The inner array is still mutable, so you can change its contents even though the parent is frozen.
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New to Ruby?
`each` is for side effects (like printing), not transformations.
It always gives you the original array back.
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Ready for a cosmic adventure? 🚀 Dive into Mission to Mars—code your own journey with Ruby! Join Isabella & her bro on a daring trip to the Red Planet. Coming out soon for ages 10–14! #LearnRuby
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