check if function exists javascript code example
Example 1: javascript check if function exists
//check if sayHello() function exists
if (typeof sayHello === "function") {
// This function exists
}
Example 2: check if function exists javascript
if (typeof payment === "function")
{
// Do something
}
Example 3: javascript check if function exists
if (typeof sourceObj.someMethod === "function") {
// you are safe using the method
sourceObj.someMethod();
}
Example 4: js check if function exists
if (typeof yourFunctionName == 'function') {
yourFunctionName();
}