decodeURIComponentintermediatedecodeURIComponent('a%3D1%26b%3D2') // β 'a=1&b=2'
// %3D=equals, %26=ampersanddecodeURIComponent() decodes special URI characters like = (%3D) and & (%26).
decodeURIComponent('a%3D1%26b%3D2') decodes back to 'a=1&b=2'.
Challenge: Verify the decoding.