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CodeHS Glossary

Loop-and-a-half JavaScript

The loop-and-a-half is preferred because it avoids repeating code outside and inside the loop. By using while(true), the loop-and-a-half structure only reads in the variable inside the loop: var SENTINEL = -1; function start(){ while(true){ var num = readInt("Number? "); if(num == SENTINEL) { break; } println(num); } }