I've got arrays nested like this:
[["1", "apple 1"], ["1", "pear 2"], ["2", "lemon 1"], ["12", "lemon 12"]]
I'd like to replace all the occurrences of 1, 2, and 12 at nested array index 0 with "one", "two", and "twelve" respectively, so the result is this:
[["one", "apple 1"], ["one", "pear 2"], ["two", "lemon 1"], ["twelve", "lemon 12"]]
How do I do it?
var arr = [
[ '1', 'apple 1' ], [ '2', 'pear 2' ], [ '3', 'lemon 3' ]
]
var numbers = [ 'one', 'two', 'three' ]
arr.forEach(function (el) {
el[0] = numbers[el[0]]
})
arr // [ [ 'one', 'apple 1' ], [ 'two', 'pear 2' ], [ 'three', 'lemon 3' ] ]
Array indexes are actually strings, that's why numbers['2'] ('2' being a string) would retrieve the third member.
To iterate over the array, you could use a for-loop, but forEach looks nicer.
forEach, map, filter, bind, Object.create and others, but also want these features to be perceived as ubiquitous and selbverstandlich. Progress is made through common effort.something like :
var obj = [["1", "apple 1"], ["1", "pear 2"], ["2", "lemon 1"], ["12", "lemon 12"]];
for ( i = 0; i < obj.length ; i++ ) {
switch(obj[i][0]) {
case "1" : obj[i][0] = "one"; break;
case "2" : obj[i][0] = "two"; break;
case "12" : obj[i][0] = "twelve"; break;
}
}
here is a jsFiddle : http://jsfiddle.net/dKZW5/1/
Edit
It seems I forgot to mention: this solution requires you to JSON encode the array: var workArr = JSON.stringify(theArr).replace(..). And once you're done: theArr = JSON.parse(workArr);
The quickest thing I could come up with is either do this:
var str = '[["1", "apple 1"], ["1", "pear 2"], ["2", "lemon 1"], ["12", "lemon 12"]]'.replace(/(\[")12/g,'$1twelve').replace(/(\[")2/g,'$1two').replace(/(\[")1/g,'$one');
But there are a couple of catches here: if write the replace(/(\[")12/g,'$1twelve') after you've replaced the ones, it won't work. so to get around this, you could do:
str = '[["1", "apple 1"], ["1", "pear 2"], ["2", "lemon 1"], ["12", "lemon 12"]]'.replace(/(\[")12"/g,'$1twelve"').replace(/(\[")2"/g,'$1two"').replace(/(\[")1"/g,'$one"');
Adding the closing quote. A more elegant solution, however is to create an object:
var replace = {'1':'one','2':'two','12':'twelve'};
And use the matched number as a property name.
