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The function clamps a middle value within a range between a defined minimum and maximum bound. The function takes three parameters: a preferred value, a minimum value, and a maximum allowed value.
/** * @param {number} value * @param {number} lower * @param {number} upper * @return {number} */ function clamp(value, lower, upper) { return Math.min(upper, Math.max(lower, value)); } // Usage example console.log(clamp(12, 0, 1)); // => 1 console.log(clamp(12, 5, 13)); // => 12 console.log(clamp(12, 15, 100)); // => 15
/** * @param {any} value * @returns any */ function fixedTwoDigits(value) { if (typeof value !== "number") { return value; } return Number(value.toFixed(3).slice(0, -1)); } // Usage example console.log(fixedTwoDigits(Math.random())); // => 0.xx
/** * @param {string} numStr1 * @param {string} numStr2 * @return {string} */ function add(num1, num2) { const num1Arr = num1.split("").map(Number); const num2Arr = num2.split("").map(Number); let carry = 0; let result = []; while (num1Arr.length || num2Arr.length || carry) { const sum = (num1Arr.pop() ?? 0) + (num2Arr.pop() ?? 0) + carry; carry = sum > 9 ? 1 : 0; result.push(sum % 10); } return result.reverse().join(""); } // Usage example console.log(add("999999999999999999", "1")); // => '1000000000000000000'
/** * @param {number} num * @return {string} */ function addComma(num) { const [integerStr, floatStr] = String(num).split("."); let count = 0; let result = ""; for (let i = integerStr.length - 1; i >= 0; i -= 1) { count += 1; result = integerStr[i] + result; if (count % 3 === 0 && i !== 0) { result = "," + result; } } return floatStr ? result + `.${floatStr}` : result; } // Usage example console.log(addComma(1)); // => '1' console.log(addComma(1000)); // => '1,000' console.log(addComma(-12345678)); // => '-12,345,678' console.log(addComma(12345678.12345)); // => '12,345,678.12345'
/** * @param {string} num * @return {string} */ function addSpacesEveryFourDigits(num) { const numStr = String(num); let result = ""; for (let i = 0; i < numStr.length; i += 1) { result += numStr[i]; if ((i + 1) % 4 === 0 && i + 1 !== numStr.length) { result += " "; } } return result.trim(); } // Example usage: console.log(addSpacesEveryFourDigits("1234567890")); // => "1234 5678 90"
/** * @param {string} arabicNumber * @return {string} */ function digitToChinese(digit) { const digitMap = ["零", "一", "二", "三", "四", "五", "六", "七", "八", "九"]; return digitMap[digit]; } function arabicToChineseNumber(arabicNumber) { let chineseNumber = ""; for (let i = 0; i < arabicNumber.length; i++) { chineseNumber += digitToChinese(arabicNumber[i]); } return chineseNumber; } // Usage example console.log(arabicToChineseNumber("12345")); // => 一二三四五
/** * @param {Array} Array * @return {arr} */ function mergeContinousNumbers(arr) { if (!arr || arr.length === 0) { return []; } const merged = []; let start = arr[0]; let end = arr[0]; for (let i = 1; i < arr.length; i += 1) { if (arr[i] === end + 1) { end = arr[i]; } else { if (start === end) { merged.push(String(start)); } else { merged.push(`${start}->${end}`); } start = end = arr[i]; } } if (start === end) { merged.push(String(start)); } else { merged.push(`${start}->${end}`); } return merged; } // Usage example console.log(mergeContinousNumbers([1, 2, 3, 4, 6, 7, 9, 13, 15])); // => ['1->4', '6->7', '9', '13', '15']
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