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by sandreas
536 days ago
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var is global scope, const is block scoped... <script>
var x = 1;
if(x < 5) {
// now y is global (window.y can be accessed everywhere)
// using const y = x * 2 would be inaccessible outside the if block
var y = x * 2;
console.log('double x is: " + y);
}
</script>
Besides that, var is "pulled" upwards, as if it was the first line in the function. That may have side effects. |
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