What would be the most straightforward way to convert the type of each element in an array on a one-by-one basis?
For example, if I have:
var a = ["2013", "72", "68", "76", "75", "76", "73"]
how could I transform a to the following, keeping the first item a string and converting the rest to integers:
["2013", 72, 68, 76, 75, 76, 73]
In lodash, I can manage _.map(_.values(record), _.toNumber) converting the entire array to numbers, but how would I map to each item in the array?
Use Array#map with the index of the loop.
var a = ["2013", "72", "68", "76", "75", "76", "73"];
a = a.map(function (b, i) {
return i ? Number(b) : b;
});
console.log(a);
a variable declaration should end with a comma and so it does.
Using lodash methods map, toNumber and checking not the first in array:
var a = ["2013", "72", "68", "76", "75", "76", "73"];
var result = _.map(a, function(v) {
return a[0] !== v ? _.toNumber(v) : v;
});
console.log(result);<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.12.0/lodash.min.js"></script>Something like this maybe :
var a = ["2013", "72", "68", "76", "75", "76", "73"]
var newArray = [];
a.map(function(d, i) {
if (i == 0) {
newArray.push(d)
} else {
newArray.push(parseInt(d, 10))
}
return newArray
})
console.log(newArray)
var a = ["2013", "72", "68", "76", "75", "76", "73"]
var b = a.map(function(item) {
if (item.length === 4) {
return item;
} else {
return parseInt(item, 10);
}
});
console.log(b)