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19 lines
878 B
TypeScript
19 lines
878 B
TypeScript
/**
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* This function splits an array into two sub arrays on the first instance of
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* element (from the left). If the array does not contain the element. The
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* return value is defined to be `[array, [], false]`. If the element is in
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* the array then the return value is `[left, right, true]` where `left` is
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* the elements of `array` from `[0, index)` and `right` is `(index, length)`
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* @param array the full array to split into two sub-arrays
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* @param element the element in the middle of the array
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* @returns the left and right sub-arrays which when conjoined with `element`
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* is the same as `array`, and `true`
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*/
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export function split<T>(array: T[], element: T): [T[], T[], boolean] {
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const index = array.indexOf(element);
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if (index < 0) {
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return [array, [], false];
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}
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return [array.slice(0, index), array.slice(index+1, array.length), true];
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} |