arguments is the name of a local, array-like object available inside every function. It’s quirky, often ignored, but the source of much programming wizardry; all the major JavaScript libraries tap into the power of the arguments object. It’s something every JavaScript programmer should become familiar with.
Inside any function you can access it through the variable: arguments, and it contains an array of all the arguments that were supplied to the function when it was called. It’s not actually a JavaScript array; typeof arguments will return the value: “object”. You can access the individual argument values through an array index, and it has a length property like other arrays, but it doesn’t have the standard Array methods like push and pop.
SitePoint » arguments: A JavaScript Oddity.
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