I have a string :
var str = "123, 124, 234,252";
I want to parse each item after split and increment 1. So I will have:
var arr = [124, 125, 235, 253 ];
How can I do that in NodeJS?
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4 Answers
Use split and map function:
var str = "123, 124, 234,252";
var arr = str.split(",");
arr = arr.map(function (val) { return +val + 1; });
Notice +val - string is casted to a number.
Or shorter:
var str = "123, 124, 234,252";
var arr = str.split(",").map(function (val) { return +val + 1; });
edit 2015.07.29
Today I'd advise against using + operator to cast variable to a number. Instead I'd go with a more explicit but also more readable Number call:
var str = "123, 124, 234,252";
var arr = str.split(",").map(function (val) {
return Number(val) + 1;
});
console.log(arr);edit 2017.03.09
ECMAScript 2015 introduced arrow function so it could be used instead to make the code more concise:
var str = "123, 124, 234,252";
var arr = str.split(",").map(val => Number(val) + 1);
console.log(arr);
answered Feb 28, 2013 at 11:34
Michał Miszczyszyn
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Comments
var str = "123, 124, 234,252";
var arr = str.split(",");
for(var i=0;i<arr.length;i++) {
arr[i] = ++arr[i];
}
Comments
If you're using lodash and in the mood for a too-cute-for-its-own-good one-liner:
_.map(_.words('123, 124, 234,252'), _.add.bind(1, 1));
It's surprisingly robust thanks to lodash's powerful parsing capabilities.
If you want one that will also clean non-digit characters out of the string (and is easier to follow...and not quite so cutesy):
_.chain('123, 124, 234,252, n301')
.replace(/[^\d,]/g, '')
.words()
.map(_.partial(_.add, 1))
.value();
2017 edit:
I no longer recommend my previous solution. Besides being overkill and already easy to do without a third-party library, it makes use of _.chain, which has a variety of issues. Here's the solution I would now recommend:
const str = '123, 124, 234,252';
const arr = str.split(',').map(n => parseInt(n, 10) + 1);
My old answer is still correct, so I'll leave it for the record, but there's no need to use it nowadays.
Comments
You may use regular expression to slpit the string
var str = "123, 124, 234,252";
var regex = /\,\s*/
var arr = str.split(regex).map(d => (+d) + 1)
console.log(arr) // Output [124, 125, 235, 253]You may be want to matches numbers so:
var str = "123, 124, 234,252";
var regex = /\d+/gm
var arr = str.match(regex).map(d => (+d) + 1)
console.log(arr) // Output: [124, 125, 235, 253]