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wren/test/core/map/to_string.wren
Bob Nystrom 78655c68b0 Simple string interpolation.
This allows "%(...)" inside a string literal to interpolate the
stringified result of an expression.

It doesn't support custom interpolators or format strings, but we can
consider extending that later.
2015-11-11 07:55:48 -08:00

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// Handle empty map.
System.print({}.toString) // expect: {}
// Does not quote strings.
System.print({"1": "2"}.toString) // expect: {1: 2}
// Nested maps.
System.print({1: {2: {}}}) // expect: {1: {2: {}}}
// Calls toString on elements.
class Foo {
construct new() {}
toString { "Foo.toString" }
}
System.print({1: Foo.new()}) // expect: {1: Foo.toString}
// Since iteration order is unspecified, we don't know what order the results
// will be.
var s = {1: 2, 3: 4, 5: 6}.toString
System.print(s == "{1: 2, 3: 4, 5: 6}" ||
s == "{1: 2, 5: 6, 3: 4}" ||
s == "{3: 4, 1: 2, 5: 6}" ||
s == "{3: 4, 5: 6, 1: 2}" ||
s == "{5: 6, 1: 2, 3: 4}" ||
s == "{5: 6, 3: 4, 1: 2}") // expect: true
// TODO: Handle maps that contain themselves.