Looking to extract specific data from an array?
var data = new Array("1111_3", "1231_54", "1143_76", "1758_12");
If you want to extract just the numbers before the underscore in data[0] (1111), you can use the following method:
var ids = new Array();
// example: ids = Array("1111", "1231", "1143", "1758");
This code snippet will copy all the extracted numbers into the 'ids' Array. Do you need a PHP-like solution, or is using loops the best approach?
Thank you!
Extremely straightforward:
let ids = [];
for(let k = 0, x = data.length; k < x; ++k) {
let idString = data[k];
ids.push(idString.substring(0, idString.indexOf('_')));
}
gracefulness:
data.map(function(item){
return item.split('_')[0];
})
This element is in accordance with the ECMA-262 standard.
However, if you desire to cater to old, outdated browsers, consider using jQuery (or any other framework you prefer; most of them have a custom map function):
$.map(data, function(item){
return item.split('_')[0];
})
What you're looking to achieve is known as a 'map' function. Certain browsers have built-in support for this, but for more reliable results, you can consider using underscore.js (http://documentcloud.github.com/underscore/)
You could implement it in one of the following ways:
_(data).map(function(x){
return x.split('_')[0];
});
or
_.map(data, function(x){
return x.split('_')[0];
});
When dealing with a large array, it can be more efficient to concatenate it into a string and then split the string rather than using traditional iteration methods.
var data = ["1111_3", "1231_54", "1143_76", "1758_12"];
var ids= data.join(' ').replace(/_\d+/g,'').split(' ');
alert(ids)
/* returned value: (Array)
1111,1231,1143,1758
*/
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