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array.slice(1,3) extracts a section without changing it.
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Keeps only the elements that match a condition.
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Reduces array to a single value using a function, like a sum.
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Runs a function for each element in an array.
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Returns the first item that passes a test.
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…array unpacks elements into another array or function.
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Collects multiple inputs into a single array parameter.
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Objects group related data together, like {name:"Liam", age:14}.
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Object.keys(obj) returns an array of all keys.