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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 | 1x 5x 5x 5x 5x 5x 5x 5x 5x 19x 19x 19x 5x 5x | /**
* Options for the {@link count} function
* @group String
* @category Operations
*/
export type CountOptions = {
/** if true, counts overlapping strings */
overlap?: boolean;
};
/**
* Compute the number of times a substring occurs within a string
* @param input - The string
* @param substring - The substring to look for
* @param options - see {@link CountOptions}
* @returns number of times *substring* occurs within *input*
* @group String
* @category Operations
*/
export function count(
input: string,
substring: string,
{ overlap = false }: CountOptions = {},
): number {
const step = overlap ? 1 : substring.length;
let cnt = 0;
let pos = 0;
while ((pos = input.indexOf(substring, pos)) >= 0) {
cnt++;
pos += step;
}
return cnt;
}
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