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website/functions/node_modules/traverse/test/subexpr.js

@@ -0,0 +1,36 @@
+var traverse = require('../');
+var test = require('tape');
+
+test('subexpr', function (t) {
+    var obj = [ 'a', 4, 'b', 5, 'c', 6 ];
+    var r = traverse(obj).map(function (x) {
+        if (typeof x === 'number') {
+            this.update([ x - 0.1, x, x + 0.1 ], true);
+        }
+    });
+    
+    t.same(obj, [ 'a', 4, 'b', 5, 'c', 6 ]);
+    t.same(r, [
+        'a', [ 3.9, 4, 4.1 ],
+        'b', [ 4.9, 5, 5.1 ],
+        'c', [ 5.9, 6, 6.1 ],
+    ]);
+    t.end();
+});
+
+test('block', function (t) {
+    var obj = [ [ 1 ], [ 2 ], [ 3 ] ];
+    var r = traverse(obj).map(function (x) {
+        if (Array.isArray(x) && !this.isRoot) {
+            if (x[0] === 5) this.block()
+            else this.update([ [ x[0] + 1 ] ])
+        }
+    });
+    
+    t.same(r, [
+        [ [ [ [ [ 5 ] ] ] ] ],
+        [ [ [ [ 5 ] ] ] ],
+        [ [ [ 5 ] ] ],
+    ]);
+    t.end();
+});