JavaScript How can I partially sort an array based on some condition? sort partially sorted array,c++ partial sort an array,best

How can I partially sort an array in JavaScript, based on some conditions that I choose?

Given an array 

var tab = [
    {html: 'This is a test'},
    {html: 'Locked item', locked: true},
    {html: 'Another item'},
    {html: 'Another one'}
    //and 100 more items...
];

The 2nd items is called "locked", it should stays at the same place (2nd place) after the array is sorted

var tab = [
    {html: 'Another item'},
    {html: 'Locked item', locked: true},
    {html: 'Another one'},
    {html: 'This is a test'},
    //and 100 more items...
];

This is the complete code I currently have:

var tab = [
    {html: 'This is a test'},
    {html: 'Locked item', locked: true},
    {html: 'Another item'},
    {html: 'Another one'}
    //and more items...
];

tab.sort(function(a,b){
    var aVal = a.html.toLowerCase();
    var bVal = b.html.toLowerCase();
    if (aVal===bVal)
        return 0;
    else
        return aVal < bVal ? -1 : 1;

    //how to handle locked items?
});

//desire output
/*var tab = [
    {html: 'Another item'},
    {html: 'Locked item', locked: true},
    {html: 'Another one'},
    {html: 'This is a test'},
    //and more items...
];*/

console.log(tab);

See fiddle

Answer:1

Probably could be optimised, but removing all locked items and storing their initial positions, then adding them back into the sorted array should work:

var tab = [
    {html: 'This is a test'},
    {html: 'Locked item', locked: true},
    {html: 'Another item'},
    {html: 'Another one'}
    //and more items...
];

var stored = {}, newTab = [];
for(var i = 0, iLimit = tab.length; i < iLimit; i++) {
    if(tab[i].locked) {
        stored[i] = tab[i];
    } else {
        newTab.push(tab[i]);
    }
}

newTab.sort(function(a,b){
    var aVal = a.html.toLowerCase();
    var bVal = b.html.toLowerCase();
    if (aVal===bVal) {
        return 0;
    } else {
        return aVal < bVal ? -1 : 1;
    }
});

for(var indice in stored) {
    newTab.splice(indice, 0, stored[indice]);
}

console.log(newTab);

http://jsfiddle.net/qW7uH/2/

Answer:2

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