I have an array
MyArray = [
["Oswaldo","21749"],
["Mao","19580"],
["Angeline",'53692']
]
How do I convert the numbers from strings to actual numbers and save in the same array or in the new one.
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9 Answers
You can use + to cast strings to numbers:
for (var i in myArray) {
myArray[i][1] = +myArray[i][1];
}
Comments
I think Array map is more efficient and elegant:
var MyArray = [
["Oswaldo","21749"],
["Mao","19580"],
["Angeline",'53692']
];
MyArray = MyArray.map(function (obj) {
return [obj[0],parseInt(obj[1])];
});
document.write(JSON.stringify(MyArray));Comments
Note, js attempts not referencing an index , for instance where position of array item string containing only numbers may not be at index 1 within an array contained within MyArray
Try
var MyArray = [
["Oswaldo", "21749"],
["Mao", "19580"],
["Angeline", '53692']
];
MyArray = MyArray.map(function(items) {
return items.map(function(item) {
return /^\d+$/.test(item) && !/[a-z]/i.test(item) ? Number(item) : item
})
});
console.log(JSON.stringify(MyArray));
3 Comments
DrKey
We answer at the same time, but you can achieve that with just one map. Watch my answer..
guest271314
@DrKey See updated post.
js attempts to not reference at specific index within array within MyArray , for instance where array item containing numbers may not be at index 1 within array within MyArrayDrKey
Of course my function will works only if array within MyArray contains 2 values with original index. Your function works even if that array contains more than two values at random indexes. Upvoted!
Recursive iteration will let you iterate nested array, then just coherce the value to Number
function parseNum(arr) {
arr.forEach(function(value, index) {
if ( Array.isArray(value) ) {
parseNum(value);
} else if ( !isNaN(parseFloat(value)) ) {
arr[index] = (+value);
}
});
}
Comments
You can use parseInt() or parseFloat() function.
for (var i = 0; i < MyArray.length; ++i) {
MyArray[i][1] = parseInt(MyArray[i][1]);
// Or parseFloat if there is a float
}
Comments
http://jsfiddle.net/Bladepianist/rpy2aedh/1/
MyArray = [
["Oswaldo","21749"],
["Mao","19580"],
["Angeline",'53692']
];
for (var item in MyArray) {
MyArray[item][1] = parseInt(item[1], 10);
}
parseInt() if you want them in int and the "10" is for base 10. parseFloat() if you'd prefer them in that format :).
Comments
Using the open source project jinqJs
var MyArray = [
["Oswaldo","21749"],
["Mao","19580"],
["Angeline",'53692']
];
var result = jinqJs().from(MyArray).select(function(row){row[1] = Number(row[1]); return row;});
document.body.innerHTML += '<pre>' + JSON.stringify(result, null, 4) + '</pre><br><br>';<script src="https://rawgit.com/fordth/jinqJs/master/jinqjs.js"></script>
Comments
Changes to the previous example
var MyArray = [
[0, "Oswaldo","21749"],
[1, "Mao","19580"],
[2, "Angeline",'53692']
];
function buscar() {
var result = new jinqJs().from(MyArray).where(function(row){return (row[0] == '1')}).select(function(row){return row[1]});
console.log(result);
}
Comments
Two variations provided below:
The first for changing a specific index in a 2D array to numbers, as per the OP.
The second for converting every element of an array of number strings to numbers, which is the answer I was looking for when I found this page.
const stringArr = [
["Oswaldo","21749"],
["Mao","19580"],
["Angeline","53692"]
];
stringArr.forEach((el,i,arr) => arr[i][1] = +el[1]); // convert every index[1] of 2D array to number
console.log(stringArr);
const numStringArr = [
["31749","21749"],
["29580","19580"],
["63692","53692"]
];
numStringArr.forEach((el,i,arr) => arr[i] = el.map(e => +e)); // convert every element of 2D array to number
console.log(numStringArr);