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Added idx() to return index range of a given list.

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Revar Desmera 2019-07-09 18:40:36 -07:00
parent a573ccae38
commit c158d31289
1 changed files with 18 additions and 0 deletions
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18
arrays.scad
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@ -345,6 +345,21 @@ function list_fit(v, length, fill) =
let(l=len(v)) (l==length)? v : (l>length)? list_trim(v,length) : list_pad(v,length,fill); let(l=len(v)) (l==length)? v : (l>length)? list_trim(v,length) : list_pad(v,length,fill);
// Function: idx(list)
// Usage:
// i = idx(list);
// for(i=idx(list)) ...
// Description:
// Returns the range of indexes for the given list.
// Arguments:
// list = The list to returns the index range of.
// step = The step size to stride through the list. Default: 1
// Example(2D):
// colors = ["red", "green", "blue"];
// for (i=idx(colors)) right(20*i) color(colors[i]) circle(d=10);
function idx(list,step=1) = [0:step:len(list)-1];
// Function: enumerate() // Function: enumerate()
// Description: // Description:
// Returns a list, with each item of the given list `l` numbered in a sublist. // Returns a list, with each item of the given list `l` numbered in a sublist.
@ -356,6 +371,9 @@ function list_fit(v, length, fill) =
// enumerate(["a","b","c"]); // Returns: [[0,"a"], [1,"b"], [2,"c"]] // enumerate(["a","b","c"]); // Returns: [[0,"a"], [1,"b"], [2,"c"]]
// enumerate([[88,"a"],[76,"b"],[21,"c"]], idx=1); // Returns: [[0,"a"], [1,"b"], [2,"c"]] // enumerate([[88,"a"],[76,"b"],[21,"c"]], idx=1); // Returns: [[0,"a"], [1,"b"], [2,"c"]]
// enumerate([["cat","a",12],["dog","b",10],["log","c",14]], idx=[1:2]); // Returns: [[0,"a",12], [1,"b",10], [2,"c",14]] // enumerate([["cat","a",12],["dog","b",10],["log","c",14]], idx=[1:2]); // Returns: [[0,"a",12], [1,"b",10], [2,"c",14]]
// Example(2D):
// colors = ["red", "green", "blue"];
// for (p=enumerate(colors)) right(20*p[0]) color(p[1]) circle(d=10);
function enumerate(l,idx=undef) = function enumerate(l,idx=undef) =
(idx==undef)? (idx==undef)?
[for (i=[0:1:len(l)-1]) [i,l[i]]] : [for (i=[0:1:len(l)-1]) [i,l[i]]] :