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I was wondering how I'd go about implementing a method in javascript that removes all elements of an array that clear a certain condition. (Preferably without using jQuery)
Ex.
ar = [ 1, 2, 3, 4 ]; ar.removeIf( function(item, idx) { return item > 3; }); The above would go through each item in the array and remove all those that return true for the condition (in the example, item > 3).
I'm just starting out in javascript and was wondering if anyone knew of a short efficient way to get this done.
--update--
It would also be great if the condition could work on object properties as well.
Ex.
ar = [ {num:1, str:"a"}, {num:2, str:"b"}, {num:3, str:"c"} ]; ar.removeIf( function(item, idx) { return item.str == "c"; }); Where the item would be removed if item.str == "c"
--update2--
It would be nice if index conditions could work as well.
Ex.
ar = [ {num:1, str:"a"}, {num:2, str:"b"}, {num:3, str:"c"} ]; ar.removeIf( function(item, idx) { return idx == 2; }); 
662
To remove array element on condition with JavaScript, we can use the array filter method. let ar = [1, 2, 3, 4]; ar = ar.
We can use the following JavaScript methods to remove an array element by its value. indexOf() – function is used to find array index number of given value. Return negavie number if the matching element not found. splice() function is used to delete a particular index value and return updated array.
pop() function: This method is use to remove elements from the end of an array. shift() function: This method is use to remove elements from the start of an array. splice() function: This method is use to remove elements from the specific index of an array.
Array elements can be deleted using the JavaScript operator delete . Using delete leaves undefined holes in the array. Use pop() or shift() instead.
You can use Array filter method.
The code would look like this:
ar = [1, 2, 3, 4]; ar = ar.filter(item => !(item > 3)); console.log(ar) // [1, 2, 3]If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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