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What are the different keywords to declare variables in TypeScript?

Answer»

var: Declares a function-scoped or global variable. You can optionally set its value during the DECLARATION. Its behavior and scoping RULES are similar to the var KEYWORD in JavaScript. For EXAMPLE,

var foo = "bar";

let: Declares a block-scoped local variable. Similar to var, you can optionally set the value of a variable during the declaration. For example,

let a = 5;if (true) { let a = 10; console.log(a); // 10}console.log(a); // 5

const: Declares a block-scoped constant value that cannot be changed after it’s initialized.  For example,

const a = 5;if (true) { a = 10; // Error: Cannot assign to 'a' because it is a constant.(2588)}


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