I was looking at this today and discovered grep.
$(function () {
var myOriginalValues = [1, 3, 7, 3, 3, 9, 2];
var res = [];
$.each(myOriginalValues, function (i, el) {
if ($.inArray(el, res) === -1) res.push(el);
});
// Now a grep version
var grepVersion = function(arr){
return $.grep(arr,function(v,k){
return $.inArray(v, arr) === k;
})
};
var arr = ['tree',2,4,5,4,1,1,3,3,5, 'tree', 'hat']
var x = grepVersion(arr);
});
Saturday, May 24, 2014
Javascript This keyword
This is a variable that is available when you use functions, and depending on how the function was invoked This can be different things.
// This - will be global scope
function myFunction() {
console.log('This is a lot of stuff:');
console.log(this);
}
// This - will be the myThing object
var myThing = { name: 'john', age: 21};
myThing.doStuff = function(){
console.log(this);
console.log(this.name);
};
// This function outputs:
// { name: 'john', age: 21, doStuff: [Function] }
// john
(function doTheFunctions(){
myFunction();
myThing.doStuff();
})();
// This - will be global scope
function myFunction() {
console.log('This is a lot of stuff:');
console.log(this);
}
// This - will be the myThing object
var myThing = { name: 'john', age: 21};
myThing.doStuff = function(){
console.log(this);
console.log(this.name);
};
// This function outputs:
// { name: 'john', age: 21, doStuff: [Function] }
// john
(function doTheFunctions(){
myFunction();
myThing.doStuff();
})();
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