Arrays The Array object, as with arrays in other programming languages, enables storing a collection of multiple items under a single variable name and has members for performing common array operations. Description In JavaScript, arrays aren't primitives but are instead Array objects with the following core characteristics: JavaScript arrays are resizable and can contain a mix of different data types. (When those characteristics are undesirable, use typed arrays instead.) JavaScript arrays are not associative arrays and so, array elements cannot be accessed using arbitrary strings as indexes, but must be accessed using nonnegative integers (or their respective string form) as indexes. JavaScript arrays are zero-indexed: the first element of an array is at index 0, the second is at index 1, and so on — and the last element is at the value of the array's length property minus 1. JavaScript array-copy operations create shallow copies. (All standard built-in copy operations with...
CSS Grid about the two-dimensional position display:grid; grid template columns: 30% auto; grid-template-rows: 60px auto 60px; grid-template-areas:"HD HD "; grid area: "hd"; Understanding Responsive Design Why? Working media Queries Creating a Side Drawer
A function has access to the variable environment (VE) of excecution context it was created Closure : VE attached to the function, exactly as it was at the time and place the function was created A closure is the combination of a function bundled together (enclosed) with references to its surrounding state (the lexical environment). In other words, a closure gives you access to an outer function's scope from an inner function. In JavaScript, closures are created every time a function is created, at function creation time. A closure is the closed-over variable environment of the execution context in which a function wascreated, even after that execution context is gone. A closure gives a function access to all the variables of its parent function , even after that parent function has returned. The function keeps a reference to its outer scope, which preserves the scope chain throught time. A closure makes sure that a function doesn't loose connection to variable that...
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