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var funcs = {};
for (var i = 0; i < 3; i++) {
 funcs[i] = function(x) {
 console.log('My value: ' + x);
 }.bind(this, i);
}
for (var j = 0; j < 3; j++) {
 funcs[j]();
}

function log(x) {
 console.log('My value: ' + x);
}
var funcs = [];
for (var i = 0; i < 3; i++) {
 funcs[i] = log.bind(this, i);
}
for (var j = 0; j < 3; j++) {
 funcs[j]();
}

Another way that hasn't been mentioned yet is the use of Function.prototype.bind

var funcs = {};
for (var i = 0; i < 3; i++) {
 funcs[i] = function(x) {
 console.log('My value: ' + x);
 }.bind(this, i);
}
for (var j = 0; j < 3; j++) {
 funcs[j]();
}

jsFiddle

UPDATE

As pointed out by @squint and @mekdev, you get better performance by creating the function outside the loop first and then binding the results within the loop.

function log(x) {
 console.log('My value: ' + x);
}
var funcs = [];
for (var i = 0; i < 3; i++) {
 funcs[i] = log.bind(this, i);
}
for (var j = 0; j < 3; j++) {
 funcs[j]();
}

jsFiddle

Another way that hasn't been mentioned yet is the use of Function.prototype.bind

var funcs = {};
for (var i = 0; i < 3; i++) {
 funcs[i] = function(x) {
 console.log('My value: ' + x);
 }.bind(this, i);
}
for (var j = 0; j < 3; j++) {
 funcs[j]();
}

UPDATE

As pointed out by @squint and @mekdev, you get better performance by creating the function outside the loop first and then binding the results within the loop.

function log(x) {
 console.log('My value: ' + x);
}
var funcs = [];
for (var i = 0; i < 3; i++) {
 funcs[i] = log.bind(this, i);
}
for (var j = 0; j < 3; j++) {
 funcs[j]();
}

Another way that hasn't been mentioned yet is the use of Function.prototype.bind

var funcs = {};
for (var i = 0; i < 3; i++) {
 funcs[i] = function(x) {
 console.log('My value: ' + x);
 }.bind(this, i);
}
for (var j = 0; j < 3; j++) {
 funcs[j]();
}

jsFiddle

Another way that hasn't been mentioned yet is the use of Function.prototype.bind

var funcs = {};
for (var i = 0; i < 3; i++) {
 funcs[i] = function(x) {
 console.log('My value: ' + x);
 }.bind(this, i);
}
for (var j = 0; j < 3; j++) {
 funcs[j]();
}

jsFiddle

UPDATE

As pointed out by @squint and @mekdev, you get better performance by creating the function outside the loop first and then binding the results within the loop.

function log(x) {
 console.log('My value: ' + x);
}
var funcs = [];
for (var i = 0; i < 3; i++) {
 funcs[i] = log.bind(this, i);
}
for (var j = 0; j < 3; j++) {
 funcs[j]();
}

jsFiddle

Another way that hasn't been mentioned yet is the use of Function.prototype.bind

var funcs = {};
for (var i = 0; i < 3; i++) {
 funcs[i] = function(j) {
 console.log('My value: ' + j);
 }.bind(this, i);
}
for (var j = 0; j < 3; j++) {
 funcs[j]();
}

jsFiddle

Another way that hasn't been mentioned yet is the use of Function.prototype.bind

var funcs = {};
for (var i = 0; i < 3; i++) {
 funcs[i] = function(x) {
 console.log('My value: ' + x);
 }.bind(this, i);
}
for (var j = 0; j < 3; j++) {
 funcs[j]();
}

jsFiddle