Add catch(console.error) to all examples

Some examples have been failing to load in some browsers, and this
ensures that whenever the promise to load Rust code fails we log any
errors happening instead of accidentally failing silently.

This helped debug a bit in #897

examples/add/index.js

@@ -1,4 +1,6 @@
 // For more comments about what's going on here, check out the `hello_world`
 // example
 const rust = import('./add');
-rust.then(m => alert('1 + 2 = ' + m.add(1, 2)));
+rust
+  .then(m => alert('1 + 2 = ' + m.add(1, 2)))
+  .catch(console.error);

examples/canvas/index.js

@@ -1,5 +1,5 @@
 // For more comments about what's going on here, check out the `hello_world`
 // example.
-import('./canvas').then(canvas => {
-  canvas.draw();
-});
+import('./canvas')
+  .then(canvas => canvas.draw())
+  .catch(console.error);

examples/char/index.js

@@ -4,13 +4,15 @@ let imp = import('./char.js');
 let mod;
 
 let counters = [];
-imp.then(wasm => {
+imp
+  .then(wasm => {
       mod = wasm;
       addCounter();
       let b = document.getElementById('add-counter');
       if (!b) throw new Error('Unable to find #add-counter');
       b.addEventListener('click', ev => addCounter());
-});
+  })
+  .catch(console.error);
 
 function addCounter() {
     let ctr = mod.Counter.new(randomChar(), 0);

examples/closures/index.js

@@ -1,4 +1,6 @@
 // For more comments about what's going on here, check out the `hello_world`
 // example
 const rust = import('./closures');
-rust.then(m => m.run());
+rust
+  .then(m => m.run())
+  .catch(console.error);

examples/console_log/index.js

@@ -2,4 +2,6 @@
 // example
 const rust = import('./console_log');
 
-rust.then(m => m.run());
+rust
+  .then(m => m.run())
+  .catch(console.error);

examples/dom/index.js

@@ -1,4 +1,6 @@
 // For more comments about what's going on here, check out the `hello_world`
 // example
 const rust = import('./dom');
-rust.then(m => m.run());
+rust
+  .then(m => m.run())
+  .catch(console.error);

examples/fetch/index.js

@@ -1,11 +1,12 @@
 const rust = import('./fetch');
 
-
-rust.then(m => {
+rust
+  .then(m => {
       m.run().then((data) => {
           console.log(data);
 
           console.log("The latest commit to the wasm-bindgen %s branch is:", data.name);
           console.log("%s, authored by %s <%s>", data.commit.sha, data.commit.commit.author.name, data.commit.commit.author.email);
       })
-});
+  })
+  .catch(console.error);

examples/hello_world/index.js

@@ -3,4 +3,6 @@
 // will work here one day as well!
 const rust = import('./hello_world');
 
-rust.then(m => m.greet('World!'));
+rust
+  .then(m => m.greet('World!'))
+  .catch(console.error);

examples/import_js/index.js

@@ -2,4 +2,6 @@
 // example
 const rust = import('./import_js');
 
-rust.then(m => m.run());
+rust
+  .then(m => m.run())
+  .catch(console.error);

examples/julia_set/index.js

@@ -14,4 +14,5 @@ import('./julia_set')
         });
 
         wasm.draw(ctx, 600, 600, -0.15, 0.65);
-    });
+    })
+    .catch(console.error);

examples/paint/index.js

@@ -1,5 +1,5 @@
 // For more comments about what's going on here, check out the `hello_world`
 // example.
-import('./wasm_bindgen_paint').then(paint => {
-  paint.main();
-});
+import('./wasm_bindgen_paint')
+  .then(paint => paint.main())
+  .catch(console.error);

examples/performance/index.js

@@ -1,4 +1,6 @@
 // For more comments about what's going on here, check out the `hello_world`
 // example
 const rust = import('./performance');
-rust.then(m => m.run());
+rust
+  .then(m => m.run())
+  .catch(console.error);

examples/wasm-in-wasm/index.js

@@ -1,4 +1,6 @@
 // For more comments about what's going on here, check out the `hello_world`
 // example
 const rust = import('./wasm_in_wasm');
-rust.then(m => m.run());
+rust
+  .then(m => m.run())
+  .catch(console.error);

examples/webaudio/index.js

@@ -1,4 +1,5 @@
-import('./webaudio').then(rust_module => {
+import('./webaudio')
+  .then(rust_module => {
     let fm = null;
 
     const play_button = document.getElementById("play");
@@ -35,4 +36,5 @@ import('./webaudio').then(rust_module => {
         fm.set_fm_amount(event.target.value);
       }
     });
-});
+  })
+  .catch(console.error);

examples/webgl/index.js

@@ -1,5 +1,5 @@
 // For more comments about what's going on here, check out the `hello_world`
 // example.
-import('./webgl').then(webgl => {
-  webgl.draw();
-});
+import('./webgl')
+  .then(webgl => webgl.draw())
+  .catch(console.error);