JS – Funktionen

Es gibt in JS mehrere Möglichkeiten Funktionen zu deklarieren. Hier einige davon.

function namedFunction(foo, bar) {
	return foo + bar;
}
console.log('namedFunction:', namedFunction(4, 2));
// Console output: "namedFunction: 6"
const noNamedFunction = function(foo, bar) {
	return foo + bar;
}
console.log('noNamedFunction:', noNamedFunction(4, 2));
// Console output: "noNamedFunction: 6"
const shortHandNoNameFunction = {
	myArray: ['sna', 'fu'], // declare Array
	get(index) { // get = freely definable function name
		return this.myArray[index];
	},
	set(...elements) { // set = freely definable function name
		this.myArray.push(...elements)
	},
	getMyArray(){
		return this.myArray
	}
}
console.log('shortHandNoNameFunction 1:', shortHandNoNameFunction.get(1));
// Console output: "shortHandNoNameFunction 1: fu"
shortHandNoNameFunction.set('42', 'qux')
console.log('shortHandNoNameFunction 2:', shortHandNoNameFunction.getMyArray());
// Console output: "shortHandNoNameFunction 2: (4) ['sna', 'fu', '42', 'qux']"
let arrowShortFunction = (foo, bar) => foo + bar;
console.log('arrowShortFunction:', arrowShortFunction(4, 2));
// Console output: "arrowShortFunction: 6"
// Immediately Invoke Function
(function(){
	// doAnything
	console.log('immediatelyInvokeFunction');
}
)();
// Console output: "immediatelyInvokeFunction"

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Kategorisiert in Javascript