Elegant Way To Convert String Of Array Of Arrays Into A Javascript Array Of Arrays?
I have an ajax request that returns a list of values like this: '[-5, 5, 5], [-6, 15, 15], [7, 13, 12]' I need it to be a javascript array with numbers: [[-5, 5, 5], [-6, 15, 15],
Solution 1:
You can use JSON.parse()
to convert that string into an array, as long as you wrap it in some brackets manually first:
var value = "[-5, 5, 5], [-6, 15, 15], [7, 13, 12]";
var json = JSON.parse("[" + value + "]");
console.log(json);
I would suggest correcting the output at the server if possible, though.
Solution 2:
This solution is stupid in practice -- absolutely use JSON.parse
as others have said -- but in the interest of having fun with regular expressions, here you go:
functiongetMatches(regexp, string) {
var match, matches = [];
while ((match = regexp.exec(string)) !== null)
matches.push(match[0]);
return matches;
}
functionparseIntArrays(string) {
return getMatches(/\[[^\]]+\]/g, string)
.map(function(string) {
return getMatches(/\-?\d+/g, string)
.map(function(string) {
return parseInt(string);
});
});
}
parseIntArrays("[-5, 5, 5], [-6, 15, 15], [7, 13, 12]");
Solution 3:
If you're generating the data, and you trust it, just use eval
:
varstring = "[-5, 5, 5], [-6, 15, 15], [7, 13, 12]"var arrays = eval('[' + string + ']');
Alternatively, start returning well-formed JSON.
Solution 4:
In a function
var strToArr = function(string){ returnJSON.parse('[' + string + ']')}
console.log(strToArr("[-5, 5, 5], [-6, 15, 15], [7, 13, 12]"));
Solution 5:
varstring = "[-5, 5, 5], [-6, 15, 15], [7, 13, 12]";
var arr = [];
var tmp = string.split('], ');
for (var i=0; i<tmp.length; i++) {
arr.push(tmp[i].replace(/\[|\]/g, '').split(', '));
}
Typing on my iPad so I apologize in advance for any typos.
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