Arrays: Difference between revisions
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===Change an array element===
Changing a value-array element:
<lang babel>[1 2 3] dup 1 7 set ;
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{{Out}}
<pre>[val 0x1 0x7 0x3 ]</pre>
Changing a pointer-array element:
<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.
===
Convert a value-array to a list of values:
<lang babel>[1 2 3] ar2ls lsnum !</lang>
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{{Out}}
<pre>( 1 2 3 )</pre>
Convert a list of values to a value-array:
<lang babel>(1 2 3) ls2lf ;</lang>
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{{Out}}
<pre>[val 0x1 0x2 0x3 ]</pre>
Convert a pointer-array to a list of pointers:
<lang babel>[ptr 'foo' 'bar' 'baz'] ar2ls lsstr !</lang>
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{{Out}}
<pre>( "foo" "bar" "baz" )</pre>
Convert a list of pointers to a pointer-array:
<lang babel>(1 2 3) bons ;</lang>
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