substitute

1 import std.algorithm.comparison : equal;
2 
3 // substitute single elements
4 assert("do_it".substitute('_', ' ').equal("do it"));
5 
6 // substitute multiple, single elements
7 assert("do_it".substitute('_', ' ',
8                            'd', 'g',
9                            'i', 't',
10                            't', 'o')
11               .equal("go to"));
12 
13 // substitute subranges
14 assert("do_it".substitute("_", " ",
15                           "do", "done")
16               .equal("done it"));
17 
18 // substitution works for any ElementType
19 int[] x = [1, 2, 3];
20 auto y = x.substitute(1, 0.1);
21 assert(y.equal([0.1, 2, 3]));
22 static assert(is(typeof(y.front) == double));
23 
24 import std.range : retro;
25 assert([1, 2, 3].substitute(1, 0.1).retro.equal([3, 2, 0.1]));

import std.algorithm.comparison : equal;

// substitute subranges of a range
assert("apple_tree".substitute!("apple", "banana",
                                "tree", "shrub").equal("banana_shrub"));

// substitute subranges of a range
assert("apple_tree".substitute!('a', 'b',
                                't', 'f').equal("bpple_free"));

// substitute values
assert('a'.substitute!('a', 'b', 't', 'f') == 'b');

import std.algorithm.comparison : equal;
import std.range.primitives : ElementType;

int[3] x = [1, 2, 3];
auto y = x[].substitute(1, 0.1)
            .substitute(0.1, 0.2);
static assert(is(typeof(y.front) == double));
assert(y.equal([0.2, 2, 3]));

auto z = "42".substitute('2', '3')
             .substitute('3', '1');
static assert(is(ElementType!(typeof(z)) == dchar));
assert(equal(z, "41"));