Sorting an array of objects by property values
Sort homes by price in ascending order:
homes.sort(function(a, b) {
return parseFloat(a.price) - parseFloat(b.price);
});
Or after ES6 version:
homes.sort((a, b) => parseFloat(a.price) - parseFloat(b.price));
Some documentation can be found here.
For descending order, you may use
homes.sort((a, b) => parseFloat(b.price) - parseFloat(a.price));
for string sorting in case some one needs it,
const dataArr = {
"hello": [{
"id": 114,
"keyword": "zzzzzz",
"region": "Sri Lanka",
"supportGroup": "administrators",
"category": "Category2"
}, {
"id": 115,
"keyword": "aaaaa",
"region": "Japan",
"supportGroup": "developers",
"category": "Category2"
}]
};
const sortArray = dataArr['hello'];
console.log(sortArray.sort((a, b) => {
if (a.region < b.region)
return -1;
if (a.region > b.region)
return 1;
return 0;
}));Here's a more flexible version, which allows you to create reusable sort functions, and sort by any field.
const sort_by = (field, reverse, primer) => {
const key = primer ?
function(x) {
return primer(x[field])
} :
function(x) {
return x[field]
};
reverse = !reverse ? 1 : -1;
return function(a, b) {
return a = key(a), b = key(b), reverse * ((a > b) - (b > a));
}
}
//Now you can sort by any field at will...
const homes=[{h_id:"3",city:"Dallas",state:"TX",zip:"75201",price:"162500"},{h_id:"4",city:"Bevery Hills",state:"CA",zip:"90210",price:"319250"},{h_id:"5",city:"New York",state:"NY",zip:"00010",price:"962500"}];
// Sort by price high to low
console.log(homes.sort(sort_by('price', true, parseInt)));
// Sort by city, case-insensitive, A-Z
console.log(homes.sort(sort_by('city', false, (a) => a.toUpperCase()
)));To sort it you need to create a comparator function taking two arguments. Then call the sort function with that comparator function as follows:
// a and b are object elements of your array
function mycomparator(a,b) {
return parseInt(a.price, 10) - parseInt(b.price, 10);
}
homes.sort(mycomparator);
If you want to sort ascending switch the expressions on each side of the minus sign.