Assigning Values to an Array: Difference between revisions

==[[JavaScript]]==

function setElem(array, loc, val) { //returns 0 if out of bounds

if(typeof array[loc] == typeof undefined) {

return 0; //element doesn't already exist -- out of bounds

} else {

array[loc] = val

return 1; //OK

}//if

}//setElem

//use:

var ary=[10,20,30] //0,1,2 defined

var ok = setElem(ary,3,'three')

if(!ok) alert('oops, error')

Simpler if you don't mind adding an element if it does not already exist:

function writeToArray(array, loc, val) { array[loc] = val; }

==[[LSE64]]==

10 array :array

0 array 5 [] ! # store 0 at the sixth cell in the array