42 lines
1.3 KiB
Standard ML
Executable file
42 lines
1.3 KiB
Standard ML
Executable file
// Advanced Arrays Demo
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// Start with a basic array
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arr = [1, 2, 3]
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print(arr) // -> [1, 2, 3]
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// length (also works on strings)
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print(len(arr)) // -> 3
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print(len("hello")) // -> 5
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// push returns new length and mutates the array
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print(push(arr, 99)) // -> 4
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print(arr) // -> [1, 2, 3, 99]
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// pop returns the removed element and mutates the array
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last = pop(arr)
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print(last) // -> 99
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print(arr) // -> [1, 2, 3]
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// set(array, index, value) sets in place and returns the value
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print(set(arr, 1, 42)) // -> 42
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print(arr) // -> [1, 42, 3]
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// insert(array, index, value) inserts before index; returns new length
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print(insert(arr, 1, 7)) // -> 4
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print(arr) // -> [1, 7, 42, 3]
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// remove(array, index) removes at index and returns the element
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removed = remove(arr, 2)
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print(removed) // -> 42
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print(arr) // -> [1, 7, 3]
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// slicing: a[i:j] (end is exclusive), a[i:-1] means to the end
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s1 = arr[1:3]
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print(s1) // -> [7, 3]
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s2 = arr[0:-1]
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print(s2) // -> [1, 7, 3]
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// concatenation with +
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tail = [10, 20]
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combined = arr + tail
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print(combined) // -> [1, 7, 3, 10, 20]
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