Created
May 11, 2016 22:14
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Variable number of args in js, passing from function to function, manipulating, etc.
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| #!/usr/bin/env node | |
| // Shows how to manipulate variable number of arguments, passing them | |
| // around, etc. | |
| // To just pass a variable number of arguments along, do this. This can be | |
| // useful in a constructor, to pass the args to an init function, for example. | |
| function passArgs() { | |
| done.apply(this, arguments); | |
| } | |
| // To manipulate the list before passing it along, first turn it into an | |
| // array. | |
| function prependArg() { | |
| var args = Array.prototype.slice.call(arguments); | |
| args.unshift('(he said)'); | |
| done.apply(this, args); | |
| } | |
| // Same, but a slightly different manipulation | |
| function pushArg() { | |
| var args = Array.prototype.slice.call(arguments); | |
| args.push("again!"); | |
| done.apply(this, args); | |
| } | |
| // This is just a wrapper for console.log. Again, passing args along ... | |
| function done() { | |
| console.log.apply(console, arguments); | |
| } | |
| // Try them out: | |
| passArgs('and', 'now'); | |
| prependArg('for', 'something'); | |
| pushArg('completely', 'different'); | |
| // Output: | |
| // > and now | |
| // > (he said) for something | |
| // > completely different again! |
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