In what way does this function have the ability to output a singular object?

function list() {
  return Array.prototype.slice.call(arguments, 0); //I'm struggling to understand this line
}

var list1 = list(1, 2, 3); // [1, 2, 3]

I stumbled upon this code snippet showcasing the slice method and I'm curious about how the call() function can iterate through each argument provided to the list function using the "arguments" property.

I am puzzled by how passing just the "arguments" property as the context for the slice() function results in accessing all the items. Is there some recursion happening that I'm not seeing?

Answer №1

Converting the arguments object into an array is the main purpose of this function.

When the call method of a function is invoked, the value of this within the function is determined by the supplied object. Another way to achieve this is:

[].slice.call(arguments);

Therefore, within the slice method, this refers to the arguments object and not the empty array at the beginning of the expression.

However, it's important to note that using this approach may not be suitable for non-native objects (e.g., DOM objects like a NodeList) as it could lead to failures in certain browsers. Additionally, it's crucial to understand that this is not synonymous with "context"; rather, it serves as just one parameter within a function's execution context.

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