CODEWITHSUNDEEP
javascriptarrays
user10319
user10319

Reputation: 25

Adding a Unique Element to an Array

I have an array of objects called seasons of length 300, and I trying to search through a certain property "Date" and add it to an array if it has not been found before. So far I have

var day=[];
for (var i=1; i<300; i++) {
    var found=false;
    for (var j=0; j<day.length; j++) {
        if (day[j]==seasons[i]["Date"]) {
            found=true;
            break;
        }
        if (!found) {
            day[day.length]=seasons[i]["Date"];
        }
    }
}

I'm not too sure where this is going wrong, and would appreciate some help. Thanks

Upvotes: 1

Views: 61

Answers (1)

Kijewski
Kijewski

Reputation: 26022

You break out of the inner for-loop, so the if (!found) block is never executed.

Just put it after the inner loop:

for (var i = 1; i < 300; i++) {
    var found = false;
    for (var j = 0; j < day.length; j++) {
        if (day[j] == seasons[i]["Date"]) {
            found = true;
            break;
        }
    }
    if (!found) {
        day[day.length] = seasons[i]["Date"];
    }
}

Or do it in the if-block:

for (var i = 1; i < 300; i++) {
    for (var j = 0; j < day.length; j++) {
        if (day[j] == seasons[i]["Date"]) {
            day[day.length] = seasons[i]["Date"];
            break;
        }
    }
}

I guess the latter solution is easier to understand.

Upvotes: 1

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