Fixed #765: FunctionAssignmentNode.toString() returning a string in…

…compatible with the function assignment syntax

HISTORY.md

@@ -1,6 +1,12 @@
 # History
 
 
+## not yet released, version 3.8.2
+
+- Fixed #765: `FunctionAssignmentNode.toString()` returning a string
+  incompatible with the function assignment syntax.
+
+
 ## 2016-12-15, version 3.8.1
 
 - Implemented function `mad` (median absolute deviation). Thanks @ruhleder.

lib/expression/node/FunctionAssignmentNode.js

@@ -139,8 +139,7 @@ function factory (type, config, load, typed) {
     if (needParenthesis(this, parenthesis)) {
       expr = '(' + expr + ')';
     }
-    return 'function ' + this.name +
-        '(' + this.params.join(', ') + ') = ' + expr;
+    return this.name + '(' + this.params.join(', ') + ') = ' + expr;
   };
 
   /**

test/expression/node/FunctionAssignmentNode.test.js

@@ -284,7 +284,7 @@ describe('FunctionAssignmentNode', function() {
 
   it ('should respect the \'all\' parenthesis option', function () {
     var expr = math.parse('f(x)=x+1');
-    assert.equal(expr.toString({parenthesis: 'all'}), 'function f(x) = (x + 1)');
+    assert.equal(expr.toString({parenthesis: 'all'}), 'f(x) = (x + 1)');
     assert.equal(expr.toTex({parenthesis: 'all'}), '\\mathrm{f}\\left(x\\right):=\\left( x+1\\right)');
   });
 
@@ -294,7 +294,7 @@ describe('FunctionAssignmentNode', function() {
     var o = new OperatorNode('+', 'add', [a, x]);
     var n = new FunctionAssignmentNode('f', ['x'], o);
 
-    assert.equal(n.toString(), 'function f(x) = 2 + x');
+    assert.equal(n.toString(), 'f(x) = 2 + x');
   });
 
   it ('should stringify a FunctionAssignmentNode conataining an AssignmentNode', function () {
@@ -303,7 +303,7 @@ describe('FunctionAssignmentNode', function() {
     var n1 = new AssignmentNode(new SymbolNode('a'), a);
     var n = new FunctionAssignmentNode('f', ['x'], n1);
 
-    assert.equal(n.toString(), 'function f(x) = (a = 2)');
+    assert.equal(n.toString(), 'f(x) = (a = 2)');
   });
 
   it ('should stringify a FunctionAssignmentNode with custom toString', function () {