function-as

Pass functions as if they had, one or more, constant args

Usage

functionrun_callback(callback){// run callback with five strings and no error (i.e. null)callback(null,"one","two",'three','four','five');}// Will be passed as callback functionfunctionfive_strings(err,one,two,three,four,five){console.log('result:',err,one,two,three,four,five);console.log("\n");}console.log("A normal call");run_callback(five_strings);console.log("Set first params as '0'");run_callback(five_strings.asfirst('0'));console.log("Set first params as [caller specified] and '1'");run_callback(five_strings.asfirst(undefined,'1'));console.log("Set last params as '5'");run_callback(five_strings.aslast('5'));console.log("Set last params as '4' and [caller specified]");run_callback(five_strings.aslast('4',undefined));console.log("Set first params as '0' and last as '5'");run_callback(five_strings.as(['0'],['5']));console.log("Set first params as [caller specified],'1', '2'\n"+"and last as '4', '5'");run_callback(five_strings.as([undefined,'1',"2"],["4",'5']));console.log("Set first params as 'ZERO' and last as 'FIVE'\n"+"by chaining calls to asfirst() and aslast()");run_callback(five_strings.asfirst('ZERO').aslast('FIVE'));

Output:

A normal call
result: null one two three four five
Set first params as '0'
result: 0 one two three four five
Set first params as [caller specified] and '1'
result: null 1 two three four five
Set last params as '5'
result: null one two three four 5
Set last params as '4' and [caller specified]
result: null one two three 4 five
Set first params as '0' and last as '5'
result: 0 one two three four 5
Set first params as [caller specified],'1', '2'
and last as '4', '5'
result: null 1 2 three 4 5
Set first params as 'ZERO' and last as 'FIVE'
by chaining calls to asfirst() and aslast()
result: ZERO one two three four FIVE