I have an array in javascript like this (1,2,3,4,5,6,7,8) and i want to remove al the values that are smaller than 5. So the array that remains is (1,2,3,4). How to do this with javascript or jquery...
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1Your question conflicts with itself, please reword.Teemu– Teemu2014-03-30 18:51:54 +00:00Commented Mar 30, 2014 at 18:51
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6 Answers
You can filter the array with array.filter()
var array = [1,2,3,4,5,6,7,8];
var new_array = array.filter(function(item) {
return item < 5;
});
or if you have to support IE8 and below, you can do it the old fashion way
var array = [1,2,3,4,5,6,7,8],
new_array = [];
for (var i=0; i<array.length; i++) {
if (array[i] < 5) new_array.push(array[i])
}
1 Comment
Manuel Richarz
xD jup. i forget about it. but yes, he's right. but be aware of browser compatiblity with nativ filter method. have a look here developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…
I think you want to remove items larger than 5, but jquery grep should do it:
1 Comment
Manuel Richarz
if you don't want to load the big jquery libary, use underscore instead. in underscore the right method is named _filter. underscorejs.org/#filter
Use .map(). This will remove values less than 5 and remaining array values will be removed from array.
var arr = $.map( [ 1,2,3,4,5,6,7,8 ], function( n ) {
return n < 5 ? n : null;
});
console.log(arr);
or
Use .grep(). This will remove values less than 5 and remaining values will be removed from the array.
var arr = $.grep( [ 1,2,3,4,5,6,7,8 ], function( n ) {
return n < 5;
});
console.log(arr);
I will suggest you to go with grep based on jsperf result.
4 Comments
Manuel Richarz
you are not removing the wrong values you just change these values to null. but they are still there. better is $.grep() or .filter()
Kiran
@ManuelRicharz: Could you please check array length it is showing 4. Hope map will work.
Manuel Richarz
yes, the length is not counting null-values. but the memory is still allocated.
Felix Kling
@ManuelRicharz: jQuery's map function is different than the native map function. It removes the array element if the callback returns
null or undefined (see the documentation). And of course null values are considered for length.var orig= [1,2,3,4,5,6,7,8];
just in case they're out of order:
var copy=orig.sort();
then:
var result = copy.splice(0,copy.lastIndexOf(4)+1);
Comments
In this case you can use JavaScript is good in compare of jQuery. Because JavaScript *Execution* fast compare to a jQuery.
Check this Demo jsFiddle
JavaScript
var filtered = [1,2,3,4,5,6,7,8].filter(issmall);
function issmall(element) {
return element < 5 ;
}
console.log(filtered);
Result
[1, 2, 3, 4]
JavaScript filter() Method
Comments
Var arr = [1,2,3,4,5,6,7];
var newarr = [];
For(var i=0 ; i<=arr.length ; i++){
if(arr[i] < 5){
newarr.push(arr[i]);
}
}
