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math-expression-generator

Math Expression Generator

CircleCI

Computes random arithmetic expressions (of configurable length) that evalute to a given number.

Usage

import { generateExpression } from 'math-expression-generator';

const expression = generateExpression({
  target: 20,
  length: 2
});

console.log(expression); // [15, '+', 5]

const longExpression = generateExpression({
  target: 4828,
  length: 5
});

console.log(longExpression); // [ 2, '*', 13, '*', 10, '*', 1207, '/', 65 ]

Evaluate the expression

If you want to evaluate the returned expression (to verify it is correct, for example), you can use mathjs (but there are plenty of other library solutions out there):

import { generateExpression } from 'math-expression-generator';
import math from 'mathjs';

const expression = generateExpression({
  target: 20,
  length: 2
});

const result = math.eval(expression);

console.log(result); // 20

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