Determine whether a given value is a function object.
Checks if value is classified as a Function object.
Kind: Exported function
Returns: boolean - Returns true if value is correctly classified,
else false.
| Param | Type | Default | Description |
|---|---|---|---|
| value | * |
The value to check. | |
| [allowClass] | boolean |
false |
Whether to filter ES6 classes. |
Example
import isFunction from 'is-function-x';
console.log(isFunction()); // false
console.log(isFunction(Number.MIN_VALUE)); // false
console.log(isFunction('abc')); // false
console.log(isFunction(true)); // false
console.log(isFunction({name: 'abc'})); // false
console.log(isFunction(function() {})); // true
console.log(isFunction(new Function())); // true
console.log(isFunction(function* test1() {})); // true
console.log(isFunction(function test2(a, b) {})); // true
console.log(isFunction(async function test3() {})); // true
console.log(isFunction(class Test {})); // false
console.log(isFunction(class Test {}, true)); // true
console.log(
isFunction((x, y) => {
return this;
}),
); // true
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