Abs [绝对值]

# 介绍

在数学中，实数 a 的绝对值或模，记号为 | a|，是指去掉 a 的符号所得的非负值。若 a 是正数，则 $|a|=a$ ；若 x 是负数（则 $-a$ 是正数），则 $|a|=-a$ ；零的绝对值为零（ $|0|=0$ ）。

# 实现

# JavaScript

/**
 * @function abs
 * @description This script will find the absolute value of a number.
 * @param {number} num - The input integer
 * @return {number} - Absolute number of num.
 * @see https://en.wikipedia.org/wiki/Absolute_value
 * @example abs(-10) = 10
 * @example abs(50) = 50
 * @example abs(0) = 0
 */

const abs = (num) => {
  const validNumber = +num // converted to number, also can use - Number(num)

  if (Number.isNaN(validNumber)) {
    throw new TypeError('Argument is NaN - Not a Number')
  }

  return validNumber < 0 ? -validNumber : validNumber // if number is less then zero mean negative then it converted to positive. i.e -> n = -2 = -(-2) = 2
}

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# 参考

编辑

上次更新: 2022/10/18, 20:15:06

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