Javascript array search and remove string?

Loop through the list in reverse order, and use the .splice method.

var array = ['A', 'B', 'C']; // Test
var search_term = 'B';

for (var i=array.length-1; i>=0; i--) {
    if (array[i] === search_term) {
        array.splice(i, 1);
        // break;       //<-- Uncomment  if only the first term has to be removed
    }
}

The reverse order is important when all occurrences of the search term has to be removed. Otherwise, the counter will increase, and you will skip elements.

When only the first occurrence has to be removed, the following will also work:

var index = array.indexOf(search_term);    // <-- Not supported in <IE9
if (index !== -1) {
    array.splice(index, 1);
}

I'm actually updating this thread with a more recent 1-line solution:

let arr = ['A', 'B', 'C'];
arr = arr.filter(e => e !== 'B'); // will return ['A', 'C']

The idea is basically to filter the array by selecting all elements different to the element you want to remove.

Note: will remove all occurrences.

EDIT:

If you want to remove only the first occurence:

t = ['A', 'B', 'C', 'B'];
t.splice(t.indexOf('B'), 1); // will return ['B'] and t is now equal to ['A', 'C', 'B']