You want to convert the array-like object arguments to a real array.
Array prototypeslice() methodcall() methodGiven: a function that takes different parameters and accesses them via the arguments object.
function printAllArguments() {\n let values = arguments;\n for(let i=0; i<values.length; i++) {\n console.log(values[i]);\n }\n}\nprintAllArguments(2, 3, 4);Get a reference to the Array prototype.
function printAllArguments() {\n let arrayPrototype = Array.prototype;\n ...\n}\n...Get a reference to the slice() method. (The slice() method creates a shallow copy of a part of an array and returns a new array. If you omit any parameters it copies the whole array.)
function printAllArguments() {\n let arrayPrototype = Array.prototype;\n let sliceMethod = arrayPrototype.slice;\n ...\n}\n...Call the slice() method using the call() method.
function printAllArguments() {\n let arrayPrototype = Array.prototype;\n let sliceMethod = arrayPrototype.slice;\n let values = sliceMethod.call(arguments);\n for(let i=0; i<values.length; i++) {\n console.log(values[i]);\n }\n}\nprintAllArguments(2, 3, 4);Combine the code from the previous three steps.
\nfunction printAllArguments() {\n let values = Array.prototype.slice.call(arguments);\n for(let i=0; i<values.length; i++) {\n console.log(values[i]);\n }\n}\nprintAllArguments(2, 3, 4);Voilá, there you got a real array now, e.g., you can call array methods like forEach, map, reduce and filter on it.
function printAllArguments() {\n let values = Array.prototype.slice.call(arguments);\n values.forEach(function(value) {\n console.log(value);\n });\n}\nprintAllArguments(2, 3, 4);Since ES2015: use Array.from() to create an array based on an array-like object:
function printAllArguments() {\n let values = Array.from(arguments);\n values.forEach(function(value) {\n console.log(value);\n });\n}\nprintAllArguments(2, 3, 4);And while you are in ES2015 you can also use fat arrow functions:
\nfunction printAllArguments() {\n let values = Array.from(arguments);\n values.forEach((value) => {\n console.log(value);\n });\n}\nprintAllArguments(2, 3, 4);And while you are at it, use rest parameters, which are real arrays:
\nfunction printAllArguments(...values) {\n values.forEach((value) => {\n console.log(value);\n });\n}\nprintAllArguments(2, 3, 4);