how can i remove all the key/value pairs from following map, where key starts with X.
var map = new Object();
map[XKey1] = Value1;
map[XKey2] = Value2;
map[YKey3] = Value3;
map[YKey4] = Value4;
EDIT
Is there any way through regular expression, probably using ^ .
Something like map[^XKe], where key starts with 'Xke' instead of 'X'
You can iterate over map keys using Object.key.
Object.keys(map).forEach(function (key) {
if(key.match('^'+letter)) delete obj[key];
});
So here is an other version of removeKeyStartsWith with regular expression as you said:
function removeKeyStartsWith(obj, letter) {
Object.keys(obj).forEach(function (key) {
//if(key[0]==letter) delete obj[key];////without regex
if(key.match('^'+letter)) delete obj[key];//with regex
});
}
var map = new Object();
map['XKey1'] = Value1;
map['XKey2'] = Value2;
map['YKey3'] = Value3;
map['YKey4'] = Value4;
console.log(map);
removeKeyStartsWith(map, 'X');
console.log(map);
Solution with Regex will cover your need even if you use letter=Xke as you said but for the other solution without Regex , you will need to replace :
Key[0]==letter with key.substr(0,3)==letter
