Can I use "map" as a substitute for "for each"/"for in"?
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by John Mee
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Published on 2010-04-23T04:54:50Z
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2010/04/23
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JavaScript
|loop
For a little while now javascript has the "map" function to loop over arrays.
It appears possible to use it as a 'foreach' operator for example:
var arr = ['a','b','c']
var doubles = arr.map(function(val){
return val + val
})
Is this better or worse than saying
for(var i in arr){ ...
50/50: saves having to use the index but adds a callback; it doesn't seem very common so I hesitate to use it but still want to.
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