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--- programmieren:javascript:js_function_exists [2021/03/16 09:02] – jgehrke
+++ programmieren:javascript:js_function_exists [2022/12/17 12:28] (current) – external edit 127.0.0.1
@@ Line 23: / Line 23: @@
 </code>
-Verändert nach folgender Quelle: [[https://stackoverflow.com/questions/1042138/how-to-check-if-function-exists-in-javascript|Stackoverflow Beitrag(1)]], [[https://stackoverflow.com/questions/8592047/check-if-a-function-exists-with-its-name-in-a-string|Stackoverflow Beitrag(2)]] und [[https://developer.mozilla.org/de/docs/Web/JavaScript/Reference/Global_Objects/Array/includes|MDN » array.includes()]]
+Verändert nach folgender Quelle: [[https://stackoverflow.com/questions/1042138/how-to-check-if-function-exists-in-javascript|Stackoverflow Beitrag (1)]], [[https://stackoverflow.com/questions/8592047/check-if-a-function-exists-with-its-name-in-a-string|Stackoverflow Beitrag (2)]] und [[https://developer.mozilla.org/de/docs/Web/JavaScript/Reference/Global_Objects/Array/includes|MDN » array.includes()]]
+**Alternative wie es underscore.js macht**
+Dieser Code ist auch gut, hat jedoch den Nachteil, das ''obj'' existieren muss, ansonsten gibt es einen Fehler.
+<code javascript>
+is_function = function( obj ) {
+  return !!(obj && obj.constructor && obj.call && obj.apply);
+};
+</code>
+Quelle: [[https://stackoverflow.com/questions/5999998/check-if-a-variable-is-of-function-type|Stackoverflow Beitrag (3)]]