Create join_array_like_objects.md

snippets/join_array_like_objects.md

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+### Joining an array-like object
+
+The following example joins array-like object (arguments), by calling Function.prototype.call on Array.prototype.join.
+
+```
+function f(a, b, c) {
+  var s = Array.prototype.join.call(arguments);
+  console.log(s); // '1,a,true'
+}
+f(1, 'a', true);
+```