18 lines
537 B
Plaintext
18 lines
537 B
Plaintext
/**
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* Concatenates two arrays faster than the array spread operator.
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*/
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export const concatArrays = <T, U>(
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array1: readonly T[],
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array2: readonly U[],
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): readonly (T | U)[] => {
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// Pre-allocate for better V8 optimization
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const combinedArray: (T | U)[] = new Array(array1.length + array2.length)
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for (let i = 0; i < array1.length; i++) {
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combinedArray[i] = array1[i]!
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}
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for (let i = 0; i < array2.length; i++) {
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combinedArray[array1.length + i] = array2[i]!
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}
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return combinedArray
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}
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