javascript / intermediate
Snippet
Labelled Loop Control in Nested Operations
Labeled statements in JavaScript allow you to name a loop and control execution flow across nested loops. Using `break labelName` immediately exits the designated outer loop, eliminating the need for extra boolean flags or multiple break statements.
snippet.js
javascript
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const matrix = [[1, 2, 3],[4, 9, 6],[7, 8, 5]];let targetFound = false;searchLoop: for (let r = 0; r < matrix.length; r++) {for (let c = 0; c < matrix[r].length; c++) {if (matrix[r][c] === 9) {targetFound = true;break searchLoop;}}}console.log(`Target found: ${targetFound}`);
nodejs
Breakdown
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searchLoop: for (let r = 0; r < matrix.length; r++) {
Attaches the label `searchLoop` to the outer loop statement.
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break searchLoop;
Immediately terminates the outer loop labeled `searchLoop` instead of just the inner loop.