freeCodeCamp/guide/english/certifications/javascript-algorithms-and-data-structures/basic-javascript/compound-assignment-with-augmented-addition/index.md

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Compound Assignment With Augmented Addition

Compound Assignment With Augmented Addition

Computers read from left to right. So, using the '+=' operator means that the variable is added with the right number, then the variable is assigned to the sum. Like so:

var a = 9;
a += 10; // Now, 'a' is equal to 19