Arrays: Difference between revisions
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m (→{{header|Babel}}: Updated to interactive-mode syntax) |
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===Change an array element=== |
===Change an array element=== |
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Changing a value-array element: |
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<lang babel>[1 2 3] dup 1 7 set ; |
<lang babel>[1 2 3] dup 1 7 set ; |
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{{Out}} |
{{Out}} |
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<pre>[val 0x1 0x7 0x3 ]</pre> |
<pre>[val 0x1 0x7 0x3 ]</pre> |
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Changing a pointer-array element: |
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<lang babel>[ptr 1 2 3] dup 1 [ptr 7] set ;</lang> |
<lang babel>[ptr 1 2 3] dup 1 [ptr 7] set ;</lang> |
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Concatenation creates a new array - it does not add to an array in-place. Instead, Babel provides operators and standard utilities for converting an array to a list in order to manipulate it, and then convert back. |
Concatenation creates a new array - it does not add to an array in-place. Instead, Babel provides operators and standard utilities for converting an array to a list in order to manipulate it, and then convert back. |
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=== |
===Convert between arrays and lists=== |
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Convert a value-array to a list of values: |
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<lang babel>[1 2 3] ar2ls lsnum !</lang> |
<lang babel>[1 2 3] ar2ls lsnum !</lang> |
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{{Out}} |
{{Out}} |
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<pre>( 1 2 3 )</pre> |
<pre>( 1 2 3 )</pre> |
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Convert a list of values to a value-array: |
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<lang babel>(1 2 3) ls2lf ;</lang> |
<lang babel>(1 2 3) ls2lf ;</lang> |
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{{Out}} |
{{Out}} |
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<pre>[val 0x1 0x2 0x3 ]</pre> |
<pre>[val 0x1 0x2 0x3 ]</pre> |
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Convert a pointer-array to a list of pointers: |
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<lang babel>[ptr 'foo' 'bar' 'baz'] ar2ls lsstr !</lang> |
<lang babel>[ptr 'foo' 'bar' 'baz'] ar2ls lsstr !</lang> |
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{{Out}} |
{{Out}} |
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<pre>( "foo" "bar" "baz" )</pre> |
<pre>( "foo" "bar" "baz" )</pre> |
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Convert a list of pointers to a pointer-array: |
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<lang babel>(1 2 3) bons ;</lang> |
<lang babel>(1 2 3) bons ;</lang> |
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