A closure is the combination of a function bundled together with references to its surrounding state (the lexical environment). In simple terms, a closure gives an inner function access to the outer function's scope even after the outer function has returned.
start , end , promise , timeout .
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Advanced functional patterns frequently separate mid-level developers from senior engineers. Explain Closures with a Practical Example happy rawat javascript interview questions pdf free best
var a = 10; function square(num) var ans = num * num; return ans; var val1 = square(a); Use code with caution.
function debounce(func, delay) let timer; return function(...args) const context = this; clearTimeout(timer); timer = setTimeout(() => func.apply(context, args); , delay); ; Use code with caution. Throttling
Both techniques limit how often a function executes, but they serve different use cases. A closure is the combination of a function
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Hoisting is JavaScript's default behavior of moving declarations to the top of the current scope before execution. var variables are hoisted and initialized with undefined .
console.log("Start"); setTimeout(() => console.log("Timeout"); , 0); Promise.resolve().then(() => console.log("Promise"); ); console.log("End"); Use code with caution.
console.log("start"); setTimeout(() => console.log("timeout"), 0); Promise.resolve().then(() => console.log("promise")); console.log("end");