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Default can be used to set the default values for a given function, rather than specifying them as part of each function definition, but it must be used before they are defined, and it cannot be used to change them for existing definitions. (Why does Default behave like this?)

Default can be used to set the default values for a given function, rather than specifying them as part of each function definition, but it must be used before they are defined, and it cannot be used to change them for existing definitions. (Why does Default behave like this?)

See this answer for an advanced use of these functions.

These methods can be used in powerful ways such as destructuring.

• Is there any way to define pure functions with optional arguments?

• f[arg1, arg2,...,argN] vs. f[{arg1, arg2,...,argN}]
• A function that accepts a pair or a list of pairs

• How to avoid collision between optional arguments and options?
• How to Combine Pattern Constraints and Default Values for Function Arguments?
• Can I make a default for an optional argument the value of another argument?
• Function argument to default under certain condition
• How can I define a Listable function only apply to a vector?
• A question about two ways to use Default
• Function with zero or one arguments

See this answer for an advanced use of these functions.

These methods can be used in powerful ways such as destructuring.

• Is there any way to define pure functions with optional arguments?

• f[arg1, arg2,...,argN] vs. f[{arg1, arg2,...,argN}]
• A function that accepts a pair or a list of pairs

• How to avoid collision between optional arguments and options?
• How to Combine Pattern Constraints and Default Values for Function Arguments?
• Can I make a default for an optional argument the value of another argument?
• Function argument to default under certain condition
• How can I define a Listable function only apply to a vector?
• A question about two ways to use Default
• Function with zero or one arguments

• How to avoid collision between optional arguments and options?
• How to Combine Pattern Constraints and Default Values for Function Arguments?
• Can I make a default for an optional argument the value of another argument?
• Function argument to default under certain condition
• A question about two ways to use Default
• Function with zero or one arguments

• How to avoid collision between optional arguments and options?
• How to Combine Pattern Constraints and Default Values for Function Arguments?
• Can I make a default for an optional argument the value of another argument?
• Function argument to default under certain condition
• How can I define a Listable function only apply to a vector?
• A question about two ways to use Default
• Function with zero or one arguments