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feat: add typescript solution to lc problem: No.2185

No.2185.Counting Words With a Given Prefix

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`@@ -63,6 +63,16 @@`
`63`	`63`	`### TypeScript`
`64`	`64`
`65`	`65`	```ts
	`66`	`+function prefixCount(words: string[], pref: string): number {`
	`67`	`+ const n = pref.length;`
	`68`	`+ let ans = 0;`
	`69`	`+ for (let str of words) {`
	`70`	`+ if (str.substring(0, n) == pref) {`
	`71`	`+ ans++;`
	`72`	`+ }`
	`73`	`+ }`
	`74`	`+ return ans;`
	`75`	`+};`
`66`	`76`	```
`67`	`77`
`68`	`78`	`### ...`

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`@@ -55,6 +55,16 @@`
`55`	`55`	`### TypeScript`
`56`	`56`
`57`	`57`	```ts
	`58`	`+function prefixCount(words: string[], pref: string): number {`
	`59`	`+ const n = pref.length;`
	`60`	`+ let ans = 0;`
	`61`	`+ for (let str of words) {`
	`62`	`+ if (str.substring(0, n) == pref) {`
	`63`	`+ ans++;`
	`64`	`+ }`
	`65`	`+ }`
	`66`	`+ return ans;`
	`67`	`+};`
`58`	`68`	```
`59`	`69`
`60`	`70`	`### ...`

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`@@ -0,0 +1,10 @@`
	`1`	`+function prefixCount(words: string[], pref: string): number {`
	`2`	`+ const n = pref.length;`
	`3`	`+ let ans = 0;`
	`4`	`+ for (let str of words) {`
	`5`	`+ if (str.substring(0, n) == pref) {`
	`6`	`+ ans++;`
	`7`	`+ }`
	`8`	`+ }`
	`9`	`+ return ans;`
	`10`	`+};`

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