Chunk an array in TypeScript

Splits an array into fixed-size pieces, generic in the element.

function chunk<T>(items: T[], size: number): T[][] {
  if (size < 1) throw new Error("size must be positive");
  const out: T[][] = [];
  for (let i = 0; i < items.length; i += size) {
    out.push(items.slice(i, i + size));
  }
  return out;
}

Keywords and builtins used here

• T
• const
• for
• function
• if
• let
• number
• return
• throw

The run, in numbers

Lines

8

Characters to type

230

Tokens

87

Three-star pace

105 tpm

At the three-star pace of 105 tokens a minute, this run takes about 50 seconds.

Type this snippet

Step 9 of 11 in Generic helpers, step 17 of 20 in Generics.

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Chunk an array in other languages

• JavaScript