Any JavaScript statement (kind-of except function declarations) can be preceded by a label: foo: var x = 0; What you’ve got there is something like that: $: doubled = 6 * 2; In your statement, “$” is the label. There’s not much point to labelled statements because there’s no goto in JavaScript. Both break and … Read more
You can just use goto to jump directly to a label. while (somethingA) { // … while (somethingB) { if (condition) { goto label1; } } } label1: // … In C-like languages, goto often ends up cleaner for breaking nested loops, as opposed to keeping track of boolean variables and repeatedly checking them at … Read more
It is not a keyword it is a label. Usage: label1: for (; ; ) { label2: for (; ; ) { if (condition1) { // break outer loop break label1; } if (condition2) { // break inner loop break label2; } if (condition3) { // break inner loop break; } } } Documentation.